United Truck and Tractor Puller Rules

United Truck and Tractor Pullers, Inc- 2009 Rulebook

Classes: (Click class name to jump to section)

Light Gas Stock
Heavy Gas Stock
Work Stock
2.6 Street Diesel
2.8 Street Diesel
Super Street
Sportsman Pickup
Super Stock Pickup
Modified Four Wheel Drive
Modified And Super Two Wheel Drive
Modified And Super Modified Mini Rods
Super Modified Diesel
Modified Tractor
6,000-7,500 lb Pro Farm Tractor
8,500-10,500 lb Super Farm Tractor

General Rules:

The officers of the U.T.T.P.I. reserve the right to interpret any and all rules set forth herein or any other rules that are in force in any U.T.T.P.I. pull as they see fit. The President has the final decision in all matters.
Trucks and drivers must be weighed in and teched in 2 hours prior to the start of each and every pull. No changing of drivers after weigh in.
A vehicle that is teched and does not meet rules or reg- ulations will be given one warning. If problem is not fixed by the NEXT pull, disqualification will occur.
No open alcoholic beverages in the pit or arena at any time. Any driver or pit crew suspected or caught drinking in the pits will cause disqualification of the pulling vehicle.
A valid state driver's license is required. Any contestant without a vaild driver's license must have prior approval by the UTTPI Board of Officers and our insurance carrier.
Safety helmets, minimum Snell 75, and safety belts are mandatory.
No passengers. No riders shall be allowed in a pulling vehicle when it is being towed or driven. No rider in or on any vehicle in pit, track, or adjacent areas.
Someone must be in/on the vehicle at ALL times when the motor is being run.
All decisions of the head track official and 2 board members are final.
All track conditions are the decision of the officials.
Any vehicle will only compete one time per class, except in the event of a pull-off situtation.
Any pull, maximum on 75 ft., unless otherwise specified, will have a repull option, but must be decided on then, and taken in that class.
The first puller in each class has a repull option, but it must be taken in that class.
All trucks are subject to be reweighed immediately after their pull at the descretion of the head track official.
Any added weight must be secured and any loss of ballast on the track is subject to disqualification.
No part of pulling vehicle shall interfere with the sled or sled hitch during a pull.
No fuel tanks, fuel lines, radiators, or water hoses are allowed in the drivers compartment.
No battery is allowed in the cab unless securely fastened to the frame and enclosed in a marine battery box.
Fuel tanks must be securely mounted and fasted to the pulling vehicle.
Maximum weight for each class includes the driver of that vehicle.
Class will be called once for line-up. Truck will be called a second time, if not in line after second call, truck will be disqualified.
Puller has 3 minutes to hook to the sled after track is ready or if after competition director calls them to the sled. Failure to do so will result in disqualification.
Each vehicle pulls in one class only.
Exhibition pullers must be discussed prior to the end of tech-in and must pay a $30.00 hook fee at the discretion of the officials.
Sled must move at least 25 feet to have sled repositoned. Only one repositioning is allowed.
The first puller is each class will have the option to repull if not satified with the first pull. The repull must be taken immediately or at the end of the class.
For mechanical reasons only, a puller may drop to last position in the class. This is allowed by the head track official's discretion. Failure of safety equipment does not classify as a mechanical failure.
Driver and two pit crew will be given pit passes at the time of weigh in. The pit crew must be off the track and behind the safety lines after hook has been made.
Tie breakers: When there is a tie for points, a pull off will determine the points champion.
A puller that attends an event with a pulling vehicle but is deemed unable to hook to sled under power, will receive last place money and NO points for that event.

Modified General Rules

SFI approved fireproof gloves are mandatory.
Fireproof headsocks and a full face helmets are mandatory for all open bodied vehicles. Fireproof driving boots are recommended for all open bodied vehicles.
All drivers must wear a minimum SFI 3.2 Spec approved fire suit.
No fuel primer bottles shall be carried on any vehicles while competing in a contest.
No dual wheels, chains or tire studs are acceptable.
All tires must have rubber compound contact between the tire and the ground surface.
No tire repairs such as boot sections, vulcanized spots, etc. Tires will not be acceptable if ground through first ply of cords.
No clevis, chains. or cable is allowed in the hitching device.
Hitch point must be visble for sled hookup. Trucks may compete without tailgate or rear door for greater hookup visibility.
All pulling vehicles must be equipped with a starter interrupter switch on the gear shift which will allow starter engagement only in the neutral gear shift position or parked position on an automatic transmission.
All pulling vehicles using an automatic transmission must be equipped with a positive reverse gear lockout.
On two wheel drive and four wheel drive trucks, a kill switch with a 2 inch diameter ring must be located in the rear-center of the truck ( maximum 6 inches off center in any direction), and no more than 24 inches above the point of hook. Cable from sled will attach to kill switch.
Trucks must have a presentable bed or flatbed.
A neutral safety switch system is required on all pulling vehicles. A white light, automotive quality, minimum 2 inches in diameter, must be mounted directly above or below safety kill switch at the rear of the vehicle. A light in the driver's compartment must be operated off the same system. Both lights are to be activated by the shift lever so the lights wil be lit ONLY when the vehicle is in neutral.
The point of hook on trucks and big tractors must have a minumum 3 inch hole for ease of hookup. Mini rods must have a minimun 3 inch hole.
All pulling vehicles must have an automatic ignition kill switch on spark ignition engines and an air shut off on diesel engines. Kill switch must also shut off electric fuel pump. These controls must be operated for the drivers seat and from the rear of the truck.
All fuel injected engines must have a fuel shut off valve control within easy reach of the driver.
All exhaust must discharge vertically. Height to be a minimum of one foot above the bend in the pipe which discharges verticially measured from top of the pipe to the bottom of the bend. All exhaust pipes must be securely attatched. Vertical is defined as " being in plumb" with a 10 degree varience in any direction permitted. Venturi type headers are acceptable.
All engine driven fans must have a shroud , 360 degrees around the fan. A shroud can be no more that 1 inch from the radiator and no less than 1/4 inch past the back edge of the fan blades.
All injection or butterfly shafts on engines must have dual return-to-idle arms and springs; one on each end of the shaft.
All vehickes which run automotive engines are limited to 650 cubic inches total displacement.
A deflection sheild is required on both sides of the engine. A shield must extend the complete length of the block casting and be securly fastened. The shield must be made of aluminum or steel, minimum of 0.060" thick.
Starter motors, fuel injection pumps, and exhaust headers may not be used as shielding. Shielding may cover/pass behind starter or fuel pump.
Shielding on all V or Y type engines must extend from the base of the head or the uppermost point of the piston travel to 2 inches below the bottom center of the crankshaft throw and be securely fastened.
Shields must be solid. Motor mounts, filters, steering rods, etc. cannot serve as part of the shield. Solid frame rails with no holes can serve as part of all of the shield, provided it covers the required area of the clock casting.
Automatic transmissions MUST be covered by an SFI 4.1 approved or better, full length safety blanket.
Pulling vehicle must be equipped with a minimum 2 1/2 pound, dry power type fire extinguisher, fully charged, with a guage in working condition and within easy reach of the driver.
General rules apply.

RAIN

Any class not completed for any reason will be considered a rain out.
A class will be official when 2/3 of the pullers have made a pull.
A session of pulling will be official when 1/2 of the advertised classes are completed.
If purse is not paid toa cancelled class, entry fee will be refunded.
UTTPI officers will decide when class is rained out of a session.

PULL-OFFS

Each competitor will have two (2) attempts to make a measurable pull.
In a pull-off, each puller will hook in the order that they pulled in the original class. NO dropping of positions is allowed in a pull-off.
If the track officials feel that there has been an error in sled setting, pull-off may be restarted. In this case, the first puller may come right back or drop to last.
In a pull-off, a floating line finish will be used.

Summary of Causes for Disqualification
All disqualifications are not limited to these causes:

Illegal fuel.
Out of bounds. Out of bounds is defined as any part of the pulling vehicle touching the boundary line.
Loss of excessive liquid. Excessive liquid is defined as loss of excessive oil or fuel, except due to breakage.
Loss of weight under the green flag.
Loss or failure of safety equipment under green flag.
Unsafe operation of vehicle.
Unprofessional or unsportsman like conduct.
Intoxication of driver or crewmen.
Illegal equipment.
Leaving starting line under red flag.
Jerking of the sled under green flag.
Excessive argument with track officals.
Deliberate delay of event.
Being too close to the track.
Attacking an official.

Protest Clause
Any contestant who feels that another contestant's vehicle in his class is illegal, may protest that vehicle to the head track official, wutha $500.00 deposit. Protests must be made before the next class begins. If illegal, the protestor would get deposit refunded. If found illegal, cibtestabt will be disqualified from participating in UTTPI events for one year fromthe date of that event. Driver is responsible for tear down of his/her motor in the presence of the head track official and one board member within 24 hours of protest.

Stock Gas Rules

Weight classes will be 6000 lbs and 7000 lbs.
Factory stock appearance must be retained. Must be street legal.
DOT approved tires only. No bar tires or cut tires.
No suspension limiting devices permitted including inflated air bags.
No ball hitches allowed.
Hitch height is maximum 26 inches.
Naturally aspirated only. Gasoline or propane are the onlyacceptable fuels.
Hanging weights are allowed but cannot extend more than 60 inches from centerline of front axle. No loose weights in cab or under hood allowed.
Seat belts and helmets are required.

Work Stock

Weight limit is 8000 lbs.
Weights are permitted. Hanging front weights are prohibited. Weights may be added in the bed of the truck. If used, the must be securely fastened to the bed. Final decisions rest with the UTTPI Technical Department.
The batteries must be securely mounted. They may not be located in the driver compartment or forward of the radiator core support.
The body must be the OEM truck body, including the full bed floor. The body must retain full sheet metal. Metal after-market hoods are permitted. Fiberglass is prohibited. The hood must be closed and securely latched while the vehicle is hooked to the sled. The complete OEM firewall and OEM floor pan is mandatory.
Four-wheel hydraulic brakes are mandatory.
The OEM chassis is mandatory. The engine must be in the OEM location for the body used. The vehicle must retain the full OEM chassis. Wheel tubs, back-half conversions, tube chassis, etc., are prohibited.
Radiators must be in the stock location and be of at least stock size
All drivers must have a valid state drivers license.
An OEM transmission and transfer case are mandatory. They must have been an option on a one-ton or smaller pickup.
The OEM restraint system is mandatory and must be worn.
The engine is limited to a stock-appearing, OEM make-specific compression ignition engine. NITROUS OXIDE is prohibited along with other oxygen extenders as well as the use of PROPANE is also prohibited. All system components MUST be removed from the truck.
The exhaust must exit rearward of the driver’s compartment. Stacks exiting through the hood or fender well are prohibited. If the muffler or catalytic converter have been changed from stock, two 3/8 inch diameter bolts must be installed through the exhaust pipe in a cross pattern within one inch of each other as close to the turbo as is practical.
A fire extinguisher system is permitted but not mandatory. It must be securely mounted.
The fuel must be pump #1/#2 diesel only. Soy/Bio-diesel fuel is permitted. Off-road diesel fuel is prohibited.
The fuel injection pump is limited to a stock-appearing, OEM engine model-specific pump only. The use of multiple high-pressure common-rail fuel pumps is prohibited. Powerstroke engines with a single factory turbo may utilize a second HPOP. Pumps from different years in the same engine model may be interchanged.
The OEM fuel tank is mandatory and must be used. Racing fuel cells are prohibited and must be removed from the vehicle.
All engines turning 4500 RPM and higher must be equipped with a harmonic balancer or damper meeting SFI Spec 18.1.
The hitch must be a receiver-style hitch; reinforcements are permitted. Reinforcements must not extend forward of the centerline of the rear axle. Trick hitches are prohibited. The hooking point must be the rear-most point on the vehicle and must be rearward of the stock location of the tailgate. The hitch must be horizontal to the ground and stationary in all directions. Bumpers may be notched or removed. The hitch’s height from the ground may not exceed 26 inches. The hooking point will be measured to the center of the clevis loop.
A complete interior, including dashboard, door panels, headliner, etc., is mandatory. Two matching front seats are mandatory. Aftermarket seats are permitted; they must be fully upholstered. All factory controls (lights, signals, horn, windows, wipers, etc.) must be retained and be operative. The use of hand-throttle controls are prohibited.
Non-OEM rear-end housings are prohibited. It must have been an option on a one-ton or smaller pick up. Rear axle bolts must be covered by a cap or shield.
Non-OEM rear-end housings are prohibited. It must have been an option on a one-ton or smaller pick up. Rear axle bolts must be covered by a cap or shield.
Complete headlight and taillight assemblies (all) are mandatory and must be operative. Complete OEM windshield and windows are mandatory. Windows must be operative per factory specifications; that is, they must open and close via OEM electrical or mechanical means.
The upper mounting point for strut assemblies must be in the factory location. Adjustable caster/camber pillow ball mounts are permitted. The lower control arm may be strengthened provided factory-mounting points to chassis are maintained. The lower mounting point for the strut assembly may be modified for improved caster or camber. Strut tower braces, lower tie bars, sway bars, and limit straps are permitted. Traction bars and devices are permitted. Final decisions rest with the UTTPI Technical Department.
An OEM-style suspension is mandatory. Lowering or raising the vehicle height with suspension modifications is permitted. Traction bars and devices are permitted; they must be bolt-on only; welds are permitted for attachment to frame or axle housing. All OEM suspension mounting points must be retained and used. Sway bars, limit straps, and camber kits are permitted. The rear suspension must maintain a minimum compression shock travel of one inch; compression stops must be adjustable. All rear suspensions must use at least one working shock absorber per wheel. Airbag spring assistance is permitted; airbag compressors must be disconnected.
The tires must be DOT street tires. Cut tires are prohibited.
Non-OEM transfer cases are prohibited. The transfer case must have been an option on a one-ton or smaller pick up truck.
Non-OEM transmissions are prohibited. Aftermarket torque converters, valve bodies and internal components are permitted. Transmission brakes are prohibited. Any non-OEM floor-mounted automatic transmission shifter must be equipped with a spring-loaded positive reverse lockout device to prevent the shifter from accidentally being put into reverse gear. A functional neutral safety switch is mandatory. All transmission lines must be metallic or high-pressure-type hose. All vehicles with engines running 4500 RPM or more and using an automatic transmission must be equipped with a transmission shield meeting SFI Spec 4.1 and must be labeled accordingly. A blanket-type shield is permitted; it must be appropriately labeled as meeting SFI Spec 4.1 and it must extend from the rear of the block to the front of tail housing with a minimum six inch overlap where it is fastened. All non-blanket-type shields must incorporate two (or one, per manufacturers instructions) 3/4 inch by 1/8 inch straps that bolt to the shield on each side and pass under the transmission pan unless the transmission pan is labeled as meeting SFI Spec 4.1. All vehicles with engines running 4500 RPM or more and using an automatic transmission must be equipped with a flex plate meeting SFI Spec 29.1 and be covered by a flex plate shield meeting SFI Spec 30.1.
Non-OEM transmissions are prohibited. Aftermarket internal components are permitted. A clutch meeting minimum SFI Spec 1.1 or 1.2 is mandatory on all vehicles with engines running 4500 RPM or more. All manual transmissions must be clutch assisted. Sequential shifters are prohibited. All vehicles with engines running 4500 RPM or more and equipped with a manual transmission must have a flywheel shield labeled as meeting minimum SFI Spec 6.3 or greater. Applications for which an SFI Spec flywheel shield is not available may use a properly attached SFI 4.1 or 4.2 blanket that completely covers the bell housing; it must be attached to the block and extend rearward to the transmission with a minimum six inch overlap where it is fastened.
The turbocharger is limited to a stock-appearing, OEM/Factory make-specific charger only. Turbochargers from different years in the same make may be interchanged. 6.4 liter Powerstroke engines may utilize the factory twin-turbo configuration.
Water injection is prohibited. All system components must be removed from the truck.
The vehicle must retain the original factory wheelbase and track width.
Drivers must wear a helmet meeting Snell 90, 95, 2000, K98 or SFI Spec 31.1 or 41.1 standards. The retention strap must be securely and snugly fastened. The helmet must have the appropriate certification sticker affixed inside it.

2.6 Street Diesel

Valid DOT registration and license plates are mandatory.
8000 lbs. Maximum, with driver.
Weights are permitted. Hanging weights may not extend more than 60 inches from the centerline of the front axle.
The batteries must be securely mounted. They may not be located in the driver compartment or forward of the radiator core support.
The body must be an OEM truck body, including the full bed floor. The body must retain full sheet metal. Metal aftermarket hoods are permitted. Fiberglass is prohibited. The hood must be closed and securely latched while the vehicle is hooked to the sled. The complete OEM firewall and complete OEM floor pan is mandatory.
Four-wheel hydraulic brakes are mandatory.
The OEM chassis is mandatory. The engine must be in the OEM location for the body used. The vehicle must retain the full OEM chassis. Wheel tubs, back-half conversions, tube chassis, etc., are prohibited.
Radiators must be in the vicinity of the stock location and be of at least stock size.
An OEM transmission and transfer case is mandatory. They must have been an option on a one-ton or smaller pickup.
The OEM restraint system is mandatory and must be worn.
.All trucks must have at least six inch wide u-joint shields around the rear ujoint constructed of at least _ inch steel or 3/8 inch aluminum that will safely contain the u-joint and the end of the rear shaft. All shields must be securely mounted to the vehicle. Any front shaft u-joint that is visible from the side of the truck must be shielded to contain the u-joint and the end of the shaft.
The engine block must have been available as a factory option on a one-ton or smaller pickup truck. Blocks must circulate coolant freely. Water pumps must be present, but may be powered electrically The use of concrete or other block fillers is prohibited. All factory beltdriven accessories, excluding the air conditioning compressor, must be retained and powered via the crankshaft by a standard serpentine or ‘V’ belt. Electric fans are permitted. Aftermarket radiator assemblies are permitted, but must be securely mounted in the same general area as the OEM unit. NITROUS OXIDE is prohibited along with other oxygen extenders and the use of PROPANE is also prohibited. All system components MUST be removed from the truck.
All vehicles must be equipped to direct exhaust upward. The exhaust must exit rearward of the driver’s compartment. Stacks exiting through the hood or fender-well are prohibited. Two 3/8 inch diameter bolts must be installed through the exhaust pipe in a cross pattern within one inch of each other as close to the turbo as is practical.
A fire extinguisher system is permitted but not mandatory. It must be securely mounted.
The fuel must be pump #1/#2 diesel only. Soy/Bio-diesel fuel is permitted. Off-road diesel fuel is prohibited.
The fuel injection pump is limited to a stock-appearing, OEM engine make-specific pump only. Dual high-pressure common-rail fuel pumps or HPOPs are permitted. The P7100 injection pump, if equipped, must utilize a stock-appearing governor.
All engines turning 4500 RPM and higher must be equipped with a harmonic balancer or damper meeting SFI Spec 18.1.
The hitch must be a receiver-style hitch; reinforcements are permitted. Reinforcements must not extend forward of the centerline of the rear axle. Trick hitches are prohibited. The hooking point must be the rear-most point on the vehicle and must be rearward of the stock location of the tailgate. The hitch must be horizontal to the ground and stationary in all directions. Bumpers may be notched or removed. The hitch’s height from the ground may not exceed 26 inches on 4wd units and 30 inches on 2wd units. The hooking point will be measured to the center of the clevis loop.
A complete interior, including dashboard, door panels, headliner, etc., is mandatory. Two matching front seats are mandatory. Aftermarket seats are permitted; they must be fully upholstered. All factory controls (lights, signals, horn, windows, wipers, etc.) must be retained and be operative. The use of hand-throttle controls are prohibited.
Non-OEM rear-end housings are prohibited. The rear end must have been an option on a one-ton or smaller pick up. Rear axle bolts must be covered by a cap or shield.
The vehicle must retain the full, original OEM steering gear. The vehicle must retain the original OEM power steering assistance, if it was so equipped. Additional stabilizers are permitted. Non-OEM power assist methods are prohibited.
Complete headlight and taillight assemblies (all) are mandatory and must be operative. Complete OEM windshield and windows are mandatory. Windows must be operative per factory specifications; that is, they must open and close via OEM electrical or mechanical means.
The factory suspension configuration must be retained. The upper mounting point for strut assemblies must be in the factory location. Adjustable caster/camber pillow ball mounts are permitted. The lower control arm may be strengthened provided factory-mounting points to chassis are maintained. The lower mounting point for the strut assembly may be modified for improved caster or camber. Strut tower braces, lower tie bars, sway bars, and limit straps are permitted. Traction bars and devices are permitted. The final decision rests with the UTTPI Technical Department.
An OEM-style suspension is mandatory. Traction bars and devices are permitted; they must be bolt on only; welds are permitted for attachment to frame or axle housing. Control arms may be strengthened or replaced, provided all original mounting points are retained. Strut tower braces, lower tie bars, sway bars, limit straps, and camber kits are permitted. The rear suspension may be bolted solid to eliminate travel. All rear suspensions must use at least one working shock absorber per wheel.
The tires must be DOT street tires. Cut tires are prohibited.
Non-OEM transfer cases are prohibited. It must have been an option on a one-ton or smaller pick up truck.
Non-OEM transmissions are prohibited. Aftermarket torque converters, valve bodies and internal components are permitted. Transmission brakes are prohibited. Any non-OEM floor-mounted automatic transmission shifter must be equipped with a spring-loaded positive reverse lockout device to prevent the shifter from accidentally being put into reverse gear. A functional neutral safety switch is mandatory. All transmission lines must be metallic or high-pressure-type hose. All vehicles with engines running 4500 RPM or more and using an automatic transmission must be equipped with a transmission shield meeting SFI Spec 4.1 and must be labeled accordingly. A blanket-type shield is permitted; it must be appropriately labeled as meeting SFI Spec 4.1 and it must extend from the rear of the block to the front of tail housing with a minimum six-inch overlap where it is fastened. All non-blanket-type shields must incorporate two (or one, per manufacturers instructions) 3/4 inch by 1/8 inch straps that bolt to the shield on each side and pass under the transmission pan unless the transmission pan is labeled as meeting SFI Spec 4.1. All vehicles with engines running 4500 RPM or more and using an automatic transmission must be equipped with a flex plate meeting SFI Spec 29.1 and be covered by a flex plate shield meeting SFI Spec 30.1.
Non-OEM transmissions are prohibited. Aftermarket internal components are permitted. A clutch meeting minimum SFI Spec 1.1 or 1.2 is mandatory on all vehicles with engines running 4500 RPM or more. All manual transmissions must be clutch assisted. Sequential shifters are prohibited. All vehicles with engines running 4500 RPM or more and equipped with a manual transmission must have a flywheel shield labeled as meeting minimum SFI Spec 6.3 or greater. Applications for which an SFI Spec flywheel shield is not available may use a properly attached SFI 4.1 or 4.2 blanket that completely covers the bell housing; it must be attached to the block and extend rearward to the transmission with a minimum six inch overlap where it is fastened.
The vehicle is limited to a single turbocharger; the inducer bore on the compressor housing may be 2.6". The inlet will be measured using a 2.65-inch plug or internal calipers. Bushing from any larger turbo size down to a 2.6 turbo is PROHIBITED. A stock map width enhancement (MWE) groove is allowed. No MWE groove will be allowed that has a width greater than 1/4 inch. All provisions allowing air to the wheel other than via the bore and the MWE groove are prohibited. 6.4 liter Powerstroke engines may utilize the factory twin-turbo configuration.
Water injection is prohibited. All system components must be removed from the truck.
The vehicle must retain the original unaltered factory wheelbase and track width. Front dual-wheel spacers may be used only with accompanying positive-offset dually style wheels.
Drivers must wear a helmet meeting Snell 90, 95, 2000, K98 or SFI Spec 31.1 or 41.1 standards. The retention strap must be securely and snugly fastened The helmet must have the appropriate certification sticker affixed inside it.

2.8 Street Diesel

8000 lbs. Maximum, with driver.
Weights are permitted. Hanging weights must not extend more than 60 inches from the centerline of the front axle.
The batteries must be securely mounted. They may not be located in the driver compartment or forward of the radiator core support.
The body must be the OEM truck body, including the full bed floor. The body must retain full sheet metal. Metal after-market hoods are permitted. Fiberglass is prohibited. The hood must be closed and securely latched while the vehicle is hooked to the sled. The complete OEM firewall and complete OEM floor pan is mandatory.
Four-wheel hydraulic brakes are mandatory.
The OEM chassis is mandatory. The engine must be in the OEM location for the body used. The vehicle must retain the full OEM chassis. Wheel tubs, back-half conversions, tube chassis, etc., are prohibited.
Radiators must be in the vicinity of the stock location and be of at least stock size.
OEM transmission and transfer cases are mandatory. They must have been an option on a one-ton or smaller pickup.
The OEM restraint system is mandatory and must be worn.
All trucks must have at least six inch wide u-joint shields around the rear ujoint constructed of at least _ inch steel or 3/8 inch aluminum that will safely contain the u-joint and the end of the rear shaft. All shields must be securely mounted to the vehicle. Any front shaft u-joint that is visible from the side of the truck must be shielded to contain the u-joint and the end of the shaft.
The engine block must have been available as a factory option on a one-ton or smaller pickup truck. Blocks must circulate coolant freely. The use of concrete or other block fillers is prohibited. Electric fans are permitted. Alternators must be present and powered via the crankshaft. Water pumps must be present, but may be powered electrically. NITROUS OXIDE and other oxygen extenders as well as the use of PROPANE is also prohibited. All system components MUST be removed from the truck.
All vehicles must be equipped to direct exhaust upward. The exhaust must exit rearward of the driver’s compartment. Stacks exiting through the hood or fender-well are prohibited. Two 3/8 inch diameter bolts must be installed through the exhaust pipe in a cross pattern within one inch of each other as close to the turbo as is practical.
A fire extinguisher system is permitted but not mandatory. It must be securely mounted.
The fuel must be pump #1/#2 diesel only. Soy/Bio-diesel fuel is permitted. Off-road diesel fuel is prohibited.
The fuel injection pump is limited to a stock-appearing, OEM engine make-specific pump only. Dual high-pressure common-rail fuel pumps or HPOPs are permitted. The P7100 injection pump, if equipped, may utilize either a stock or agricultural governor.
All engines turning 4500 RPM and higher must be equipped with a harmonic balancer or damper meeting SFI Spec 18.1.
The hitch must be a receiver-style hitch; reinforcements are permitted. Reinforcements must not extend forward of the centerline of the rear axle. Trick hitches are prohibited. The hooking point must be the rear-most point on the vehicle and must be rearward of the stock location of the tailgate. The hitch must be horizontal to the ground and stationary in all directions. Bumpers may be notched or removed. The hitch’s height from the ground may not exceed 26 inches. The hooking point will be measured to the center of the clevis loop.
A complete interior, including dashboard, door panels, headliner, etc., is mandatory. Two matching front seats are mandatory. Aftermarket seats are permitted; they must be fully upholstered. All factory controls (lights, signals, horn, windows, wipers, etc.) must be retained and be operative. The use of hand-throttle controls are prohibited.
Non-OEM rear-end housings are prohibited. The rear end must have been an option on a one-ton or smaller pick up. Rear axle bolts must be covered by a cap or shield.
The vehicle must retain the full, original OEM steering gear. The vehicle must retain the original OEM power steering assistance, if it was so equipped. Additional stabilizers are permitted. Non-OEM power assist methods are prohibited.
Complete headlight and taillight assemblies (all) are mandatory and must be operative. Complete OEM windshield and windows are mandatory. Windows must be operative per factory specifications; that is, they must open and close via OEM electrical or mechanical means.
The factory suspension configuration must be retained. The upper mounting point for strut assemblies must be in the factory location. Adjustable caster/camber pillow ball mounts are permitted. The lower control arm may be strengthened provided factory-mounting points to chassis are maintained. The lower mounting point for the strut assembly may be modified for improved caster or camber. Strut tower braces, lower tie bars, sway bars, and limit straps are permitted. Traction bars and devices are permitted. The final decision rests with the UTTPI Technical Department.
An OEM-style suspension is mandatory. Traction bars and devices are permitted; they must be bolt on only; welds are permitted for attachment to frame or axle housing. Control arms may be strengthened or replaced, provided all original mounting points are retained. Strut tower braces, lower tie bars, sway bars, limit straps, and camber kits are permitted. The rear suspension may be bolted solid to eliminate travel. All rear suspensions must use at least one working shock absorber per wheel.
The tires must be DOT street tires. Cut tires are prohibited.
Non-OEM transfer cases are prohibited. It must have been an option on a one-ton or smaller pick up truck.
Non-OEM transmissions are prohibited. Aftermarket torque converters, valve bodies and internal components are permitted. Transmission brakes are prohibited. Any non-OEM floor-mounted automatic transmission shifter must be equipped with a spring-loaded positive reverse lockout device to prevent the shifter from accidentally being put into reverse gear. A functional neutral safety switch is mandatory. All transmission lines must be metallic or high-pressure-type hose. All vehicles with engines running 4500 RPM or more and using an automatic transmission must be equipped with a transmission shield meeting SFI Spec 4.1 and must be labeled accordingly. A blanket-type shield is permitted; it must be appropriately labeled as meeting SFI Spec 4.1 and it must extend from the rear of the block to the front of tail housing with a minimum six-inch overlap where it is fastened. All non-blanket-type shields must incorporate two (or one, per manufacturers instructions) 3/4 inch by 1/8 inch straps that bolt to the shield on each side and pass under the transmission pan unless the transmission pan is labeled as meeting SFI Spec 4.1. All vehicles with engines running 4500 RPM or more and using an automatic transmission must be equipped with a flex plate meeting SFI Spec 29.1 and be covered by a flex plate shield meeting SFI Spec 30.1.
Non-OEM transmissions are prohibited. Aftermarket internal components are permitted. A clutch meeting minimum SFI Spec 1.1 or 1.2 is mandatory on all vehicles with engines running 4500 RPM or more. All manual transmissions must be clutch assisted. Sequential shifters are prohibited. All vehicles with engines running 4500 RPM or more and equipped with a manual transmission must have a flywheel shield labeled as meeting minimum SFI Spec 6.3 or greater. Applications for which an SFI Spec flywheel shield is not available may use a properly attached SFI 4.1 or 4.2 blanket that completely covers the bellhousing; it must be attached to the block and extend rearward to the transmission with a minimum six inch overlap where it is fastened.
The vehicle is limited to a single turbocharger; the inducer bore on the compressor housing may be no larger than 2.8 inches measured at the smallest diameter area of the compressor wheel. A bushing may be used to downsize the compressor housing ahead of the wheel. If a bushing is used, it must be round, metallic, at least 3/4 inch long, mounted within 0.050 inch of the compressor wheel, and the inside diameter of the bushing may not exceed the 2.8 inch limit. Bushings must be securely fastened to the compressor housing. If you have any questions regarding the construction of a bushing, contact UTTPI Technical Services before the season starts. The inlet will be measured using a 2.85-inch plug or internal calipers. A stock map width enhancement (MWE) groove is allowed. No MWE groove will be allowed that has a width greater than 1/4inch. All provisions allowing air to the wheel other than via the bore and the MWE groove are prohibited.
Water injection is permitted.
The vehicle must retain the original unaltered factory wheelbase and track width. Front dual-wheel spacers may be used only with accompanying positive-offset dually style wheels.
Drivers must wear a helmet meeting Snell 90, 95, 2000, K98 or SFI Spec 31.1 or 41.1 standards. The retention strap must be securely and snugly fastened The helmet must have the appropriate certification sticker affixed inside it

Super Street

8000 lbs. Maximum with driver.
Weighs are permitted. Hanging weights may not extend more than 60 inches from the centerline of the front axle.
Batteries must be securely mounted. They may not be located in the driver compartment.
The body may be any 3/4-or 1-ton full-sized pickup truck body. The body must retain full sheet metal. The full bed floor must remain intact. Alternatively, two one-hundred pound weights may be placed directly over the centerline of the rear axle in lieu of the bed floor. The complete OEM firewall and complete OEM floor pan is mandatory. Metal after-market hoods are permitted. Fiberglass is prohibited. Tilt-bodies are prohibited. The hood must be closed and securely latched while the vehicle is hooked to the sled.
Front disk brakes are mandatory.
The OEM chassis is mandatory. The engine must be in the OEM location for the body used. The vehicle must retain the full OEM chassis. Wheel tubs, back-half conversions, tube chassis, etc., are prohibited.
The OEM restraint system is mandatory and must be worn snugly. Alternatively, a three inch-wide driver restraint system labeled as meeting SFI Spec 16.1 is permitted; this system includes a crotch strap and must be updated at two-year intervals from date of manufacture.
All trucks must have at least six-inch wide u-joint shields around the rear ujoint constructed of at least 1/4-inch steel or 3/8-inch aluminum that will safely contain the u-joint and the ends of each shaft. In addition there will be at least one shaft loop in the middle of the drive shaft. All shields must be securely mounted to the vehicle. Any front shaft u-joint that is visible from the side of the truck must be shielded to contain the u-joint and the end of the shaft. On vehicles so equipped, all intermediate drive shafts must be fully enclosed with a 5/16 inch steel or 3/8 inch aluminum shield. The shield must cover the entire length of the shaft and the universal joints and yokes at each end.
The engine block must have been available as a factory option on one-ton or smaller pickup trucks. NITROUS OXIDE and other oxygen extenders as well as the use of PROPANE is also prohibited. All system components MUST be removed from the truck.
All vehicles must be equipped to direct exhaust upward. Two 3/8 inch diameter bolts must be installed in the exhaust pipe in a cross pattern within one inch of each other as close to the final turbo as is practical.
A fire extinguisher system is permitted but not mandatory. It must be securely mounted. The fuel must be pump #1/#2 diesel only. Soy/Biodiesel fuel is permitted.
All trucks must be equipped with a driver operated fuel shutoff capable of blocking fuel flow to the injection pump. A three-way dump valve is recommended.
Location: All fuel tanks, lines, pumps, valves, etc. must be located outside of the driver compartment and within the confines of the frame and/or steel body. Fuel pressure gauge isolators, with steel-braided line, may be mounted on the firewall.
Drivers must wear a helmet meeting Snell 90, 95, 2000, K98 or SFI Spec 31.1 or 41.1 standards. The retention strap must be securely and snugly fastened The helmet must have the appropriate certification sticker affixed inside it.
All engines must be equipped with a harmonic balancer or damper meeting SFI Spec 18.1. Alternately, If a harmonic balancer is not used and a tone ring is in place, a shield across the frame under the front of the motor shielding the damper and engine fan area is required.
The hitch must be constructed of solid material that is properly attached and braced. The hooking point must be at least 44 inches rearward from the centerline of the rear axle. The hitch must be horizontal to the ground and stationary in all directions. The hitch’s height from the ground may not exceed 26 inches The hooking point will be measured to the center of the clevis loop. The final decision rests with the UTTPI Technical Department.
The vehicle must be equipped with one seat for the driver; it must be properly installed.
A sled-and driver-operated spring-loaded emergency air shut off is mandatory. The cable must terminate into a two-inch diameter steel ring.
Drivers must wear a jacket meeting SFI specification 3.2A/5 or 3.2A/15. Protective clothing exceeding this specification is permitted. The protective clothing must be labeled with the proper SFI specification.
Rear axle bolts must be covered by a cap or shield.
The axle centerline must remain in the factory location. The final decision rests with the UTTPI Technical Department.
Rigid or 4-link suspensions are permitted. Air suspension is permitted; the compressor must be disconnected.
Tires must be DOT street tires only. Cut tires are prohibited.
Aftermarket torque converters, valve bodies and internal components are permitted. Transmission brakes are prohibited. Any non-OEM floor-mounted automatic transmission shifter must be equipped with a spring-loaded positive reverse lockout device to prevent the shifter from accidentally being put into reverse gear. A functional neutral safety switch is mandatory. All transmission lines must be metallic or high-pressure-type hose. All vehicles with engines running 4500 RPM or more and using an automatic transmission must be equipped with a transmission shield meeting SFI Spec 4.1 and must be labeled accordingly. A blanket-type shield is permitted; it must be appropriately labeled as meeting SFI Spec 4.1 and it must extend from the rear of the block to the front of tailhousing with a minimum six inch overlap where it is fastened. All non-blanket type shields must incorporate two (or one, per manufacturers instructions) 3/4 inch by 1/8 inch straps that bolt to the shield on each side and pass under the transmission pan unless the transmission pan is labeled as meeting SFI Spec 4.1. All vehicles with engines running 4500 RPM or more and using an automatic transmission must be equipped with a flex plate meeting SFI Spec 29.1 and be covered by a flex plate shield meeting SFI Spec 30.1. Transmission, Manual: A clutch meeting minimum SFI Spec 1.1 or 1.2 is mandatory on all vehicles. All transmissions must be clutch assisted. Sequential shifters are prohibited. All vehicles equipped with a manual transmission must have a flywheel shield labeled as meeting minimum SFI Spec 6.3 or greater. Applications for which an SFI Spec flywheel shield is not available may use a properly attached SFI 4.1 or 4.2 blanket that completely covers the bell housing; it must be attached to the block and extend rearward to the transmission with a minimum six inch overlap where it is fastened.
Vehicles are limited to two turbochargers only. Single turbos are unlimited. For multiple turbos, the inducer bore on the atmosphere compressor housing(s) may be no larger than 3.2 inches measured at the smallest diameter area of the compressor wheel. A bushing may be used to downsize the compressor housing ahead of the wheel. If a bushing is used, it must be round, at least 3/4 inch long, mounted within 0.050 inch of the compressor wheel, and the inside diameter of the bushing may not exceed the 3.2 inch limit. If you have any questions regarding the construction of a bushing, contact UTTPI Technical Services before the season starts. A stock map width enhancement (MWE) groove is permitted. No MWE groove may be wider than 1/4 inch. All provisions allowing air to the wheel other than via the bore and MWE grooves are prohibited. The inducer bore will be measured using a 3.25 inch plug.
Water injection is permitted. Alcohol, methanol, and all other flammables are prohibited. Commercially available lube pump is allowed.
The vehicle must retain the original unaltered factory wheelbase and track width. Front dual-wheel spacers may be used only with accompanying positive-offset dually style wheels.

6200 lb Sportsman Class

4 wheel drive only.
Factory stock appearance must be retained.
Weight class is 6200 lbs.
Hitch height is 26 inches maximum.
Drive shaft loops required for all open bed vehicles
Drive shaft loops to completely cover U-joints at both ends of all srive shafts with one loop in the center if shaft is longer than 3 feet.
No ball hitches.
Gasoline and peopane are the only acceptable fuels. (No nitrous oxide allowed.)
Naturally aspirated only.
Windshields must remain as factory intended.
Weight bar permitted on front of vehicle. Maximum length is 60 inches from centerline of front axle to the farthermost point.
From the point of hook to the centerline of the rear axle shall be no less than 36% of the pickup or van wheelbase.
DOT approved tires only.
Kill switch required.
All drivers must wear a minimum SFI 3.2 Spec. approved fire suit and SFI approved fire gloves.
General rules apply.

Superstock 4 Wheel Drive

Engine is limited to 650 cubic inches, must have a cast iron block and may have either cast iron or aluminum heads. Heads must be factory produced of original type configuration with 2 valves per cylinder in the original engine compartment.
Any single four barrel carburetor with any intake manifold.
The wight class for super stock 4 wheel drive truck is 6200 lbs.
Tire size may run no larger that 112" circumference, any tires are acceptable. No more than 18" tread width.
Refer to the modified 4 wheel drive class section for additional 4x4 requirements. Chassis, drive line, hitch, and other components will be the same as modified 4x4 trucks.
Genereal rules apply.

Modified 4 Wheel Drive Trucks

Weight limit is 6200 lbs.
Modified 4x4 trucks must be factory produced steel pickups or vans, modified as defined in rule #8 below. They must have an escape hatch in the roof or in the back if doors are non working.
Modified 4x4 trucks must run naturally apirated, single automotive type engines. Fuel injection permitted but no diesel engines allowed. Engine must accept stock crankshaft. Heads shall be limited to 2 valves per cylinder.
Modified 4x4 trucks may run automotive type engine of gasoline or alcohol. The maximum cubic inches allowed is 650.
The rear of the engine block may not be farther forward than the centerline of the front axle.
Planetary axles are allowed.
Axles and hub bolt shieldes are required on all rear ends unless it is a planetary drive rear end. The minimum is 1/16 (0.060) thick steel. The hub bolts should be shielded on both the front and rear axles. The mounting shield cannot be mounted to the axle end or the hub bolts. A hole may be installed in the center of the front shield so the lock can be operated,so long as the hub end or axle bolts are covered.
The vehicle may run a frame up to a 133 inch wheel base. Its body may be factore steel. Fiberglass may be used in body components in lieu of steel provided the appearance is the same as the factory steel body. Wheel wells, front and rear, must be centered above the wheels. The bed of the pickup truck may be lengthened or shortened, only between the cab and the rear wheel wells, so the wheels are centered in the rear of the bed to make the wells centered above the wheels.
Tube frames will be allowed.
One piece fiberglass bodies will be allowed. Fiberglass bodies must be an exact replica of the original sheet metal. No car bodies allowed.
All weights must be safely secured to the vehicles and may not extend forward more than 60 inches fron the center line of the front axle. No loose weights in the cab or under the hood are allowed.
If the vehicle has doors, they must be on and closed.
Glass windshields, rear windows, and side windows can be factory tinted or clear glass. Stained glass in not allowed. If plexiglass is used, it must be clear in all windows.
The vehicle must run with a full hood except for exhaust and fuel systems.
The exhaust must exit straight up. Refer to general rules section for additional exhaust requirements.
All trucks must have working front wheel brakes. This does not include drive shaft brakes. Drive shaft brakes, if present, must be shielded 360 degrees by 5/16" steel or 3/8 inch aluminum, both ends enclosed with 1/8" steel. The floor of the body may be part of the shield if it is 1/8" steel or better.
No mud flaps or dirt deflectors are permitted.
All vehicles must utilize a grill and it must be in the original position.
No holes in the firewall and floor board are permitted.
No fuel tanks are permitted in the cab. Fuel pressure gauges, fuel pumps, and fuel lines inside the cab are also prohibited.
Vertical bumpers are required to prevent the vehicle from passing over the buckboard of the sled while backing up to hook and unhook. Bumpers to extend a minimum of 8 inches vertically. Bumpers must be of rigid construction.
All trucks must have three(3) round metal loops shielding on each drive shaft. (A two piece drive shaft must have six (6) metal loops.) A 360 degree loop must be a minimum of 3/8" wide or wider, and not more that 2 inches from the shaft in any direction. End loops must be placed no farther than 6 inches for universal joints, with a third loop in the center of the shaft, or it can be a solid tube (5/16" steel or 3/8" aluminum) meeting the above requirements. No cast metal is permissible.
All trucks will have a 360 degree metal shield around the universal joints, 5/16: steel or 3/8" aluminum. Minimum width to be 6 inches. Clearance should not exceed 2 inches between shield and universal joint. Shield should not be butt or seam welded.
From the point of hook to the centerline of the rear axle shall be no less that 36% of the pickup or van wheelbase.
If the pickup cannot run a 36% hitch because the bed is too long, the bed may be cut to the 36% hitch length. The hitch must be clear and visible for hookup purposes.
The hitch must be rigid in all directions and solidly mounted to the frame.
No devices or istallations that will raise the hitch while pulling are permitted. This will be cause for disqualification.
The hitch height cannot exceed 26" before, during, or after the pull.
Hitch point must be visible and clear for sled hookup.
The pulling point can be no less that 1 1/2" for the back edge of the hook point.
Tires have maximum 18" wide tread, and 34" tall. Pulling tires only.
General rules apply.

Modified and Super Modified Two Wheel Drives

Weight limit is 6200 lbs.
All two wheel drive vehicles shall have a single, eight(8) cylinder automotive type engine. Engine must accept a stock auromotive crankshaft. Heads shall be limited to two(2)valves per cylinder.
If the orginal vehicle has doors, they must be on and closed. Funny car type bodies may be used with an escape hatch in the roof or back if doors are non working. All two wheel drive vehicles must have a complete firewall with no holes in it.
Glass windshields, rear windows, and side windows can be factory tinted glass or clear glass. Stained glass is not allowed. If plexiglass is used it must be clear in all windows.
A vehicle must run with its hood on. Vehicles with open cockpits such as roadsters, C-cabs, and T-buckets are not required to run a hood.
Any factory production steel body truck, van, or car body may be used. Fibergalss may be used in body components in lieu of steel provided the appearance is the same as the factory steel body. All funny car fiberglass bodies are acceptable. Only factory type bodies or replicas thereof shall be permitted. No rails allowed.
Weights cannot extend further back than 12 inches from the hitching point.
All vehicles must have axle covers on the rear wheels, except vehicles with planetary type rear ends.
The maximum length of vehicle is to be 15 feet from the centerline rear axle to the forward most portion of the vehicle, including weight racks, etc. The front wheels and axle are to remain centered in the front wheel wells.
Vertical bumpers are required to prevent the vehicle from passing over the buckboard of the sled while backing up to hook or unhook. Bumpers are to extend a minimum of eight (8) inches vertically. Bumpers can be rigid in construction.
All two wheel drive trucks must have working individual rear brakes.
Modified and super modified two wheeel drive truck tires are as follows: 18.4" by 16.1". Nothing bigger.
All two wheel drive trucks must have wheelie bars. Wheelie bar length must be a minimum of 2 inches back from the furthermost point of tire with a 5 inch pad on the bottom. Maximum 6 inches high if within tire track, or 10 inches high if not within tire track.
The hitch must be rigid in all directions and solidly mounted to the vehicle frame.
The height of the hitch cannot exceed 30 inches and must be parallel to the ground.
No cable or chain can be used in the hitching device.
The pulling point can be no less than 1 1/2" from the back edge of the hook point.
Drawbar length to be no shorter than 18 inches from center of rear wheels to the point of hook.
All supercharger drive components must be shrouded on the top and sides with 0.060" steel, the shield to be wider than the drive belt or chain, and be securely mounted. Blower shield to be wider than all components, idler belt, pulleys, etc.
All vhicles with superchargers must use SRMA Spec. 6061T-6 Aluminum bolts to secure blower to intake manifold. Blower straps meeting a SFI 14.1 Spec. are required on all supercharged engines.
The driveshaft must have a minimum 2 loops on each shaft.
Two piece driveshafts must have 4 loops.
The loops must be a mimimum of 5/16" steel or 3/8" aluminum, ( no cast metal ). They must be no more than 6 inches from the joint.
All U-joints must be shielded 360 degrees by 5/16" steel or 3/8" aluminum. They must be no more that 2 inches from the shaft in any direction.
Vehicles that have a shaft between the first transmission and the second transmission need only have one loop if that shaft in no more that 12 inches long and the loop is in the middle.
Any vehicle using planetary rearends must have driveshafts fully enclosed by 5/16" steel or 3/8" aluminum.
General rules apply.

Modified and Super Modified Mini Tractors

Weight limit is 2000 lbs for naturally aspirated minis, and 2050 lbs for super mod minis.
Limitations: Modified and super modified minis are limited to 650 cubic inches.
All engines are limited to two ( 2) valves per cylinder.
Modified mini tractors shall be limited to a single automotive type engine. Engine must accept a stock crankshaft. Fuel injection shall be permitted. No blowers or turbochargers are allowed in naturally aspirated class.
Refer to Two wheel drive rules for supercharger specifications and requirements.
Engines are limited to 2 spark plugs per cylinder.
Driveline Shielding:
1. All remaining drive train, excluding additional manual transmissions, must be enclosed in 5/16" minimum steel or 3/8" aluminum, round, inside diameer not to exceed 2" more that the outside diameter of the largest universal joint, fastened every 6" or closer, with 3/8" bolts or larger bolts, grade 5, or butt and seam welded, and securely mounted to vehicle's frame. Applies to all vehicles with exposed driveshaft. No more than 1/4" of end of drivelline shall be visible with driveline shielding in place. ( Note: If U-joints are used in any driveshaft application, shielding must be 5/16" steel or 3/8" aluminum.)
2. All modified mini tractor engine-automatic transmission combinations must have:
  1. Two front engine mounts, 2 rear engine mounts, and a support saddle for rear of transmission, with 1/2" maximum clearance; or
  2. Two front engine mounts, support saddle at rear of engine, with 1/2" clearance, and a mount at rear of tranmission.
No portion of tractor shall exceed 8 feet forward of the center the rear wheel.
No portion of tractor shall exceed 6 feet in width.
Tires are limited to a rim size of 16.1" diameter. Maximum width of lugs to be no wider than that of factory manufactured 18.4 x 16.1.
Drawbars:
1. Drawbar and hitching device to be one-piece construction, with a minimum of 1 inch solid steel material.
2. No hollow tubing permitted.
3. Front part of drawbar is to have a minimum of 1/2 inch cross sectional thickness to remain on the front side of hole where drilled.
4. Minimum 1/2" pin.
5. Drawbar height adjusting bolts to be no more than 5 inches from hooking point.
6. The drawbar receiver or the material where the front of the drawbar is attached must have a minimum of 1/4" thick metal on each side of a horizontal pin drawbar. There must be a minimum of 1/2" metal remaining where the hole is drilled.
7. Point of hook:
  1. The point of hook is to have a minimum of a 2" round hole, maximum 2.25" hole.
  2. The thickness of material around the hole must be a minimum of 3/4" thick.
  3. Point of hook to be no more than 3/4" cross sectional thickness.
Stabilizer Bars:
1. Skid pads to be at least 4" square at the ground contact point.
2. Pads to be a maximum of 6" above the ground.
3. Skid pads to be a minimum of 1/2 the tire diameter when measured horizontally from rear axle centerline to rear of pad.
4. There must be one skid pad on each side of the tractor.
5. The skid pads must be strong enough to support the weight of the tractor.
6. There must be a support brace extending inward to frame, axle, or top of stabilizer bar arms.
All modified mini tractors are required to have roll-over protection. It is recommended to have either chrome-moly with minimum of 1 5/8" in diameter and a wall thickness of .095" minimum, or mild steel a minimum of 1 7/8" in diameter with a wall thickness of .083" minimum. The roll- cage should be attached rigidly in a safe manner to the frame( welded or 4 grade 8 bolts, 1/2" in diameter at all locations.) The roll cage should be able to sustain the driver from any and all injuries in the event of a roll-over situation. UTTPI reserves the right to reject any roll-over protection that it deems as unsafe.
All modified mini tractors must be equiped with working, independent rear brakes.
Modified mini must be two wheel drive.
HItch height is 13 inches maximum.
General rules apply.

Super Modified Diesel

Weight limit is 7500 lbs.
Any diesel engine is allowed. Unlimited turbos or superchargers.
Nitrous Oxide is NOT allowed. Propane, water, and alcohol injection are allowed.
Mechanical or Electronic fuel injection permitted.
Front disc brakes are mandatory.
Aftermarket transmissions and transfer cases are allowed. All automatic transmissions MUST be covered by an SFI 4.1 approved or better, full length safety blanket.
Exhaust must have either two 7/16" dia. bolts placed through the pipe perpendicular to each other, or a screen of the exact pipe diameter placed in the pipe(s) somewhere after the turbocharger(s). Exhaust(s) must exit either straight up or straight down.
Wheelbase shall not exceed 156".
26" maximum hitch height.
The hitch must be rigid in all directions and solidly mounted to the frame.
Only pulling tires will be allowed. Maximum 34" tall and 18" wide.
Hanging weights are allowed but cannot extend more that 60 inches from centerline of front axle. No loose weights in cab or under the hood will be allowed.
All trucks will have a 360 degree metal shield around the universal joints, 5/16" steel or 3/8" alumimum. Minimum width to be 6 inches. Clearance should not exceed 2 inches between shield and universal joint. Shield should not be butt welded or seam welded.
All trucks must have three(3) round metal loops shielding on each drive shaft. A two piece drive shaft must have 6 loops. A 360 degree loop must be a minimum of 3/8" wide or wider, and not more than 2 inches from the shaft in any direction. End loops must be placed no farther than 6 inches from universal joints, with a third loop in the center of the shaft,or it can be a solid tube(5/16" steel or 3/8" aluminum) meeting the above requirements. No cast metal is permissible.
From the point of hook to the centerline of the rear axle shall be no less than 36% of the pickup or van wheelbase.
Axles and hub bolt shields are required on all rear ends unless it is a planetary drive rear end. The minimum of 1/16"(0.060) thick steel. The hub bolts should be shielded on both front and rear axles. The mounting shield cannot be mounted to the axle end or the hub bolts. A hole may be installed in the center of the front shield so the lock can be operated, so long as the hub end or axle bolts are covered.
Vertical bumpers are required to prevent the vehicle from passing over the buckboard of the sled while backing up to hook or unhook. Bumpers must be of rigid construction.
A neutral safety switch light system is required on all pulling vehicles. A white light, automotive quality, minimum 2 inches in diameter, must be mounted directly above or below safety kill switch at the rear of the vehicle. A light in the driver's compartment must be operated off the same system. Both lights are to be activated by the shift lever so the lights will be lit ONLY when the vehicle is in neutral.
Air or fuel shutoff's required-consisting of (1) cable/switch to the rear of the truck to be operated by the sled, and also a cable/switch inside the drivers compartment.
Solid suspensions are allowed.
All drivers must wear a minimum SFI 3.2 spec approved fire suit.
Seat belts and helmets, minimim Snell 75 are required.
A fire extinguisher in working condition is required to be within easy reach of the driver.
General rules apply.

Modified Tractor

Tractors are limited to 2 naturally aspirated automotive type engines, but cannot exceed 2 supercharged engines or equivalent.
Tunnel rams are permitted with one or more carburetor of dominator size.
Maximum length 14 feet from center of rear axle to farthest most point, including weights.
No tricycle front ends.
Weights must be securely fastened on brackets and not extend rearward beyond tires. Weights must not obscure hitching points.
All modified tractors must have 2 supports of sufficient strength bolted to the underside frame and differential to prevent tractor splitting.
Two turnover bars must support the tractor weight and be no more than 8 inches off the ground and have a 24 inch square pad. Pads must be a minimum of 24 inches from the outside of one pad to the outside of the other.
Maximum height of drawbar is 20 inches from the top of the hitching device to the ground. Minimum drawbar is 18 inches from the center of the rear axle to the point of hook. Drawbars to be fastened no higher than center of rear axle on differential housing.
Tires can be no more that 30.5 inches wide, with a rim diameter of no more than 32 inches on tire widths no more than 24.5 inches.
General rules apply.

Pro Farm Tractor

The weight class for the Pro Farm Tractor is 6,000-7,500 lbs.
Pro Farm Tractors can run a 300 series motor, up to 399 c.i.d
A single turbo, up to a S-4 box charger will be allowed.
All other rules derived from Super Farm Tractor.

Super Farm Tractor

The weight class for Super Farm Tractor is 8,000-10,500 lbs.
Super Farm tractors can run 400 series motors, up to 640 c.i.d
All tractors must be stock appearing, including, motor, transmission, and rear end. (e.g. International series motor, along with International series transmission and rear end.)
A single turbo, up to a 3 inch box charger, may be used.
All tractors that run 3,000 r.p.m or more, must have a steel flywheel.
All tractors that run 3,000 r.p.m or more, must have roll cages. It is recommended to have either chrome-moly with minimum of 2" in diameter and a wall thickness of .095" minimum, or a mild steel a minimum of 2 1/4" in diameter with a wall thickness of .083" minimum. The roll cage should be attached rigidly to the frame. The roll cage should be able to sustain the situation. UTTPI reserves the right to reject any roll over protection that it deems unsafe.
All tractors must be equiped with an air/fuel shutoff. Three-way valves, in front of the injection pump, are acceptable for the fuel shutoff. No electrical operated air shutoffs allowed. Kill switches are to be located in the drivers compartment and in the rear center of the vehicle, 48" above the point of hook.
Stock cooling fans should be shrouded. (See general modified rules.)
Any tractor that runs 3,000 r.p.m must have weld on hubs.
Injection pumps are limited to 1 model 100, rotary or p-pump only. No French or Sigma pumps allowed.
Wheelie bars must be used, and must be able to support the weight of the tractor. (See general modified rules)