Liberty Truck and Tractor Pull

General Truck Rules 

  1. Driver must be 18 or older with a valid driver’s license.  Drivers 16 & 17 may compete with their parent’s approval
  2. No alcoholic beverages of any kind are permitted.  Alcohol consumption or unsportsmanlike behavior will be grounds for disqualification
  3. Any truck can hook only once per class.  
  4. To Protest a $150 cash fee is placed to a orange shirt tech official 5 minutes after the end of the class. Protester must tell official of detail that they are protesting to official. We have right to look visually all over the vehicle, this includes the inside of vehicle.

       A. IF A VEHICLE IS FOUND TO BE ILLEGAL, THE PROTEST MONEY IS RETURNED TO THE PERSON MAKING THE PROTEST. IF THE VEHICLE IS FOUND TO BE LEGAL, THE PROTEST MONEY IS GIVEN TO THE PROTESTED VEHICLE’S OWNER. 

 B.THE OFFICIALS & THE PROTESTED PARTY ARE THE ONLY PEOPLE ALLOWED NEAR THE VEHICLE DURING A PROTEST INSPECTION.

 C. ANYONE CAUSING A DISRUPTION DURING A PROTEST INSPECTION WILL BE AUTOMATICALLY DISQUALIFIED.

D. TECH OFFICIALS HAVE THE RIGHT TO TECH/INSPECT ANY VEHICLE AT ANY TIME WHILE THE VEHCILE IS ON THE EVENT GROUNDS.

 

 

 

 

 

 


4x4 street truck must have a hitch height of 26” maximum height to the top of the hitch.

  1. All trucks must pull from a clevis or D ring with 3’’ ID.
  2. No shifting allowed on Manuals. 
  3. A puller may have a second try if he/she stops within 75 feet of the start line. However,  in a pull-off the puller has only one try.
  4. No passengers allowed in the truck while it is pulling
  5. Loss of equipment under the green will stop the pull
  6. There will be an automatic disqualification in all classes if the pulling truck touches the sidelines.
  7. All trucks when entering or leaving the property are not to exceed 5 mph and when not pulling must remain in the pit area
  8. All registered pull trucks must have their number cards visible at all times in the windshield.
  9. Pullers may have sled spotted on starting line where desired if he/she notifies sled operator in sufficient time when sled is returning to the starting line from the previous pull
  10. All decisions concerning truck classification and/or eligibility  will be made bythe  Track Officials.
  11. Rules are subject to revision at any time by Track Officials.
  12. At all times the trucks, drivers, and the pulls will be governed by Track Officials and Flagmen.
  13. Entry fee will not be refunded if disqualified.
  14. Lack of adherence to these rules will be grounds for disqualification.
  15.  

Pro Street Small Block 4x4 Truck 5,500lb & 6,500lb

1. Trucks must be operated in a safe manner at all times and all personal body parts must stay inside cab while truck is pulling. No riders in or on the truck at any time. Must have a qualified driver in the truck at all times when engine is running. Failure to do so will result in disqualification. 

2. Truck must be equipped with 4 point racing harness. Must have fire extinguisher within arms reach of driver and securely mounted. Driver must wear single layer fire jacket and pants. Driver must also wear helmet. 

3. Trucks must be equipped with DOT approved tire. Max tire size is 35x12.50 or equivalent metric size. No dual wheels. No Modifications allowed. No grooving, recaps, paddle or bar tires ect...

4. Universal Joint shields are required over all u-joints and must be at least 4 inches long. Made of minimum 3/16 steel or 1/4 inch aluminum and centered over U-Joint.  All drive shaft lengths over 30 inches long including those with carrier bearings must be equipped with 3 drive shaft loops made  1 inch wide, 3/16 steel or 1/4 inch aluminum or rigid half inch rod.  Each loop must be 360 degrees around drive shaft. 

5.  All hitches must be safely and securely mounted and rigid in all directions . Hitches may be adjustable. Hitch opening must be at least 3.75" x 3".  Minimum hitch point from center of rear axle must be 36 inches. Hitch mounting point must be no more than 36 inches forward of rear axle center.  Hitch must be mounted horizontal not vertical. Hitch mounting may not be more than 3 inches above frame rails. Maximum hitch point of hook height is 26 inches. No hydraulic Hitches. Safety Hitch and safety bars according to PPL rules. 

6. Front end weights allowed buy not to exceed 60 inches from center of front axle to forward most point of weights or weight bracket.  Maximum width of weights or bracket is 80 inches.  There should be a metal tab welded to center of front and rear axle to hook tape measure to. No weights inside the cab. Any loss of ballast parts, excessive fluid, ect. except due to breakage will be grounds for disqualification unless done after forward momentum has stopped. 

7. Gasoline only. No diesels. All forms of nitro methane, including NOS are illegal as fuel and fuel additives for pulling. All oxygen carries and combustible accelerators are illegal. No Q16 is allowed. 

8. No turbo chargers or super chargers are allowed. 

9. Drive train must be 1 ton or less.  No 103 or 106 axles. Must retain full manufactured stock OEM frame. Ladder bars, suspension stops and solid rear mounting is allowed. Motor and axles must remain in stock OEM locations. No motor plates is allowed. Must be full size truck on full size frame.  Body and frame must be same manufacture. No altered or narrowed axles. Must have working front brakes. No drive line brakes. Wheel base must remain OEM for regular cab long bed per manufacture.  Max wheel base will be 133 inches. 

10. Dual Disc Clutch allowed. Must be operated by clutch pedal. Must have stamped steel pressure plate cover, ie: Mcloud, RAM, ect.. No crower-glide or full centrifugal clutch of any kind.  Transmission and transfer case must be stock OEM  with OEM gears.  No aftermarket gear kits or cut gears in trans or transfer case. Clutch trucks must have SFI steel fly wheel and bell housing with all bolts installed. Automatic trucks must have SFI fly wheels and safety blanket or transmission shield. All manual transmissions must have 5\16 chain fastened to trans and to the frame to prevent the transmission from rotating. Only iron case 4-speed manual transmission is allowed and must be OEM. 

11.  All trucks must have working back up lights and park/neutral safety switch in transmission. Light must be in center of truck/tailgate and no more than 6" from off center.  Must be activated when transmission with trans shifter.  No toggle switch activation.  

12. All Trucks must have stock outside sheet metal including rear bed.  Read bed must have OEM floor or minimum 1/8 inch sheet metal. No aluminum. 

13. All windows must be stock glass and side windows must raise and lower. All door latches must be stock and operational from inside and out. Fire wall must be stock and unaltered.  Headlights and taillights must be in original position but do no have to work. Any holes in the body must not present a hazard to pulling officials or any spectators. 

14. Bolt-ons allowed include aluminum intakes. No sheet metal or tunnel ram intakes. Open headers are allowed. 
Must be collectors type and must exit up through the hood or down toward the ground away from spectators. 
Electric fuel pump, water pumps and fans are allowed. 

15. Must have single carburetors. Can be any 4150 or 4160 style. Manufactured carb spacer, not to exceed 2 inches is allowed. Must have dual return springs. 

16. No magneto or crank trigger ignitions allowed. No retards or computer hook ups. Aftermarket distributor and only 6AL ignition box allowed.  Must be non-programmable. 

17. Ignition kill switch must kill the ignition and electric fuel pump and must be mounted in center of truck tailgate no more than 6 inches off center. 

18. Small block engines only. After Market Block Allowed. Must be OEM specs. No aluminum heads, iron production heads only. 

a. No Hemi Heads
b. No Bowtie Chevy
c. No LS Chevy
d. No W/2 Dodge
e. No SVO Ford
f. No 351 Cleveland 

No special high performance or special production heads.  Cylinder heads must be retain stock port location. Engine cubic limit is 408 C.I. Roller cams is allowed. No roller cam bearings. No dry sumps. No vaccum pumps. No aluminum rods. Must be push rod style engines. No overhead cams. Lifter bores must retain stock OEM for engine make. Maximum valve size 2.02 intake and 1.0 exhaust.

19. Dampers must be shielded 360 degrees or SFI approved. A deflection shield is required on both sides of the engine. Shields must extend the complete length of the block and from frame upward to bottom of valve cover and be securely fastened and made of 1.25 inch steel. 

20. All Trucks must have tow hook on the front of the the truck. Hook may be a drop style. Max width of D to be 4 inches and may extend beyond the 60 inch max from center of front axle. 

21. All trucks will be inspected prior to pulling. Officials have the right to inspect the truck at any given time. All Official decisions are final. 

22. Any interference from the truck driver, crew, friends or family on the track or anywhere in the pulling grounds will be grounds for disqualifications.  Any participants may be subject to a breathalyzer test. No alcoholic beverages allowed. Anyone caught drinking is subject to disqualification. 


2wd Modified 472 Cubic Inch Max Naturally Aspirated
5,500lb and 6,500lb

1. Only one carburetor allowed. Stock bore center only. No high pressure fuel system. 12 psi max.  No electronically controlled fuel system.

2. Gasoline only. No alcohol, no oxidizer. 

3. Special Hitches allowed. Maximum hitch height is 28".  Hitch must a minimum of 28" from center of rear axle point to hitch point. Eye hook must be 3.75" x 3".  
4. No trick hitches. Draw bar must be rigid in all directions

5. Open exhaust is allowed(must point in a safe direction)

6. No dual wheels

7. Planetary rear ends allowed. 

8. Weights must be secured safely. No weights in the cab

9. If truck bed is cut out, bed cover is required

10. 472ci is engine limit.  No aluminum blocks.  No magnetos. 

11. No tunnel Ram manifolds or sheet metal intakes
12. Maximum frame length: 15ft from center of rear axle to further most point at front of vehicle. Tow hook excluded from 15ft measurement. Tow hook not to exceed 6" beyond 15ft frame measurement. 
13. Fiberglass bodies allowed. All trucks must have front and rear fenders.  No tube frame chassis. 
14. 4wd can't pull with driveshaft removed
15. DOT approved tire and cut tires allowed.  Maximum DOT tire size is 19.5x44.  Maximum bar tire size 34.00x18.00 
16. No batteries or fuel tanks in the cab.  All fuel tanks must be in bed or back of vehicle. 
17. All 2wd trucks are required to have wheelie bar on them.  The bars must be put on as Stated in NTPA rules.  The NTPA rules states the bars can't be any closer than two inches to the rear wheels and six inches from the dirt if behind the wheel and ten inches if under the frame rail  They must have a 4"x 5" pad on the bottom(no wheels). 
Approved Cylinder Heads
a. Chevrolet(General Motors)
Any conventional cylinder head with 24 degree valve angle
The following are NOT allowed:
1. Pontiac or any Pontiac style
2. Oldsmobile or any DRCE cylinder head
3. Ray Franks 12 degree spread port or similar head
4. Brodix big duke or similar Brodix heads
5. Dart Big Chief or Similar heads
6. Ford Thor

The following are considered legal
1. Cobra Jet, Super Cobra Jet, A 429 Style
2. Blue Thunder
3. A-460, Ford Motorsports or Trick flow
4. Mopar
Any Cylinder head that doesn't have canted valves

18. All Decisions by track judges/tech officials are final 


  


PURE STREET DIESEL CLASS

 

This class is designed for beginner level pullers.

 

  • Driver must be 18 or older with a valid driver’s license. Drivers 16 & 17 may compete with their parent’s approval
  • No alcoholic beverages of any kind are permitted. Alcohol consumption or unsportsmanlike behavior will be grounds for disqualification
  • Any truck can hook only once per class.
  • Trucks must be Street Legal. This means have must have Tag, Insurance, and D.O.T approved tires (no cut or altered tires)!
  • 4×4 street truck must have a hitch height of 26” maximum height to the top of the hitch.
  • No shifting allowed on Manuals.
  • A puller may have a second try if he/she stops within 75 feet of the start line. However, in a pull-off the puller has only one try.
  • No passengers allowed in the truck while it is pulling
  • Loss of equipment under the green will stop the pull
  • There will be an automatic disqualification if truck touches the sideline.
  • All trucks when entering or leaving the property are not to exceed 5 mph and when not pulling must remain in the pit area
  • All registered pull trucks must have their number visible at all times in the windshield.
  • Pullers may have sled spotted on starting line where desired if he/she notifies sled operator in sufficient time when sled is returning to the starting line from the previous pull
  • All decisions concerning truck classification and/or eligibility will be made by the Track Officials.
  • Rules are subject to revision at any time by Track Officials.
  • At all times the trucks, drivers, and the pulls will be governed by Track Officials and Flagmen.
  • Entry fee will not be refunded if disqualified.
  • Lack of adherence to these rules will be grounds for disqualification
  •  *Must pull from a at least 3” clevis or D-ring mount on a hitch. CAN NOT pull from a ball or GI type hitch.

 Can have NO sled pulling modifications such as weight bar bracket mounts, bump stop mounts, or modified receiver hitch mount.  We will allow traction bars.

  •  
  • If you have Air Bags they must be deflated, we will check them after your run to make sure no air is in them
  •  Must wrap all exposable u-joints with duct tape for safety
  • We strongly encourage exhaust turnup pipes.
  •  No Hanging weights or weight in the cab. 9,000lb maximum weight!
  • .  
  • Tech officials have the right to turn trucks down for this class that they deem does not fit the idea of the class!

 

Work Stock Diesel Class

The Work Stock (WS) class is designed for daily-driven, on the road pickup trucks (full-bodied diesel pickup trucks). *****NO NITROUS***** 

Valid DOT registration and license plates are mandatory.

The vehicle may be two or four-wheel drive.

Designation: Weight breaks: 8000lbs and 8500lbs Weight is with driver.

REGULATIONS:

Ballast: Ballast is permitted. Hanging weights may not extend more than 60 inches from the centerline of the front axle.

Batteries: The batteries must be securely mounted. They may not be located in the driver compartment or forward of the radiator core support.

Body: 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.

Brakes: Four-wheel hydraulic brakes are mandatory.

Chassis: 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.

Cooling System: Radiators must be in the stock location and be of at least stock size.

Credentials: All drivers must have a valid state drivers license.

Driveline: An OEM transmission and transfer case are mandatory. They must have been an option on a one-ton or smaller pickup.

Driver Restraint System: The OEM restraint system is mandatory and must be worn.

Engine: 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.

*****Exhaust: all exhaust must exit upwards.  if you have stock or aftermarket exhaust that exits out the side then you must use a 90 to turn the exhaust up in the air.  This is for the safety of our spectators.****
 
Fuel: The fuel must be pump #1/#2 diesel only. Soy/Bio-diesel fuel is permitted. Off-road diesel fuel is prohibited.

Fuel Injection Pump: 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.

Fuel System: The OEM fuel tank is mandatory and must be used. Racing fuel cells are prohibited and must be removed from the vehicle.

Harmonic Balancer: All engines turning 4500 RPM and higher must be equipped with a harmonic balancer or damper meeting SFI Spec 18.1.

Hitch: 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 must have a minimum 3.750-inch inside diameter opening for the sled hook. The hooking point will be measured to the center of the clevis loop.

Interior: 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.

Rear End: 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.

Steering: 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.

Street Equipment: 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.

Suspension, Front: 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.

Suspension, Rear: 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.***  SUSPENSION BLOCKS are allowed this year!*** Sway bars, limit straps, and camber kits are permitted. All rear suspensions must use at least one working shock absorber per wheel. Airbag spring assistance is permitted; airbag compressors must be disconnected.

Tires: The tires must be DOT street tires. Cut tires are prohibited.

Transfer Case: Non-OEM transfer cases are prohibited. The transfer case must have been an option on a one-ton or smaller pick up truck.

Transmission, Automatic: 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.

Transmission, Manual: 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.

Turbocharger: 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: Water injection is prohibited. All system components must be removed from the truck.

Wheelbase: The vehicle must retain the original factory wheelbase and track width. 

***We reserve the right to bump any truck up a class if the track officials deems it fit.***
 

 
 

 

Pro Street Diesel Trucks 2.6 Smooth Bore

1.Maximum weight 8000#

2.OEM Chassis is mandatory. The vehicle must retain the full OEM chassis. Wheel tubs, back half conversions, and tube chassis are prohibited. Must retain factory OEM

wheelbase for make and model of body, not to exceed 172 inches.

3.The body must be OEM truck body including the full bed floor. No flatbeds permitted. The body must retain the full sheet metal. After market hoods permitted. The hood must be closed and securely latched when hooked to sled.

4.Complete engine must have stock appearance except where otherwise noted in these rules. Maximum engine size will be 460ci. Engine must be in OEM location for the body used. Engine must have a 3/8 diameter cable surrounding the engine block. Cable is to be positioned between #1 and #2 cylinders and is to pass through manifolds. Cable will have 4-6 inches of slack. Two cable clamps at cable splice are required

5.Cylinder head must be OEM or OEM replica for brand of engine. Outside of cylinder head must measure factory width and length. No billet heads of any material. Head must retain factory OEM valve angle. No deck plates permitted.

6.Hook point to be no closer than 44"of centerline of rear axle. Maximum hitch height of 24" with a minimum of 3.75"x3" opening. Hitch must be stationary in all directions. Hitch must be frame mounted. The use of Reese style hitches is prohibited. Hitch must be centerline of rear axle or behind. Hitch must not exceed 25 degree angle from pivot point to hook point. No hitch supports or adjusters fastened to rear axle housing shall be above center point of rear axle. Pivot pin of drawbar can be no further forward than the centerline of rear axle.

7.Turbo is limited to a 2.6" inducer bore. Bore must be smooth. No MAP Width Enhancement groove (MWE) allowed. Compressor wheel must protrude into 2.6" bore for 1/8". Bore will be checked with a 2.605"turbo plug. Plug must not be able to enter inducer bore and contact wheel. 53

8.All vehicles must be equipped with upward pointing exhaust located either directly behind cab or out of truck hood. Two 3/8 inch diameter bolts must be placed through the exhaust pipe in a cross pattern within one inch of each other and within 12 inches of turbo.

9.Front hanging weights are allowed, not to exceed 60 inches forward from the centerline of front axle. Ballast may be added in the bed of truck but must be securely fastened. Maximum weight 8000 pounds.

10.All trucks must have at least six inch wide u-joint shield around the rear u-joint constructed of at least 5/16 inch steel or 3/8 aluminum that will safely contain the u-joint and the end of the driveshaft. All shields must be securely mounted to vehicle. Any front shaft u-joints that can be visibly seen from side of truck must be shielded to contain the u-joint and the end of the driveshaft.

11.A fire extinguisher system is permitted. 2.5# fire extinguisher must be securely mounted within reach of driver. A complete OEM firewall is required.

 12.All drivers must have valid driver license and full SFI fire suit including helmet. Seatbelt/restraint must be worn.

 13.The complete OEM floor pan is mandatory. Vehicle must maintain a complete firewall. Additional gauges and pillar pods are permitted.

14. Hand throttles permitted. Diesel fuel only (See fuels page for specs) No propane or N02 or any other oxygen enhancers allowed

 15. Maximum of one P pump up to P7100 allowed. 13MM plunger limit. Ag governors permitted. The use of multiple high pressure common rail fuel pumps is legal.

16.OEM rear and front ends required. Must have come factory in a one ton or smaller vehicle.54

 

17. Axle shields are required. Shield to be .060" thickness steel or aluminum. A hole may be cut in one shield to allow operation of hub lock.

18. Safety switch (rain cap or guillotine) must shut off air to diesel engines. Switch will be securely mounted to back of vehicle. A 2 inch or bigger solid ring must be attached to end of switch. Ring must be zip tied to switch bracket. Switch must also be able to be activated in cab while driver is secured in vehicle.

19.Hydraulic steering permitted

20. Suspension (Rear)- The upper mounting point for strut assembly must be in factory location. Adjustable caster/camber pillow ball mounts are permitted. The lower control arm may be strengthened provided the factory mounting points are maintained. Strut tower braces, lower tie bars, sway bars, and limit straps are permitted. Traction bars and devices are permitted. Raising or lowering of vehicle height with suspension modifications is permitted but must be bolt on only. Welds permitted for attachment to frame and axle only. Blocked suspension permitted. No air bags. Rear suspension may be made solid.

21.Tires must be DOT approved with maximum size of 35x12.50. No studded tires or tire chains. No alterations to tires permitted. No bar or terra tires.

 22. Dual wheels are prohibited.

 23. OEM transmission and transfer case must be used. Must have come factory in a one ton or smaller vehicle.

 24. Non-OEM transmissions prohibited. Aftermarket torque convertors, valve bodies, and internal components are permitted.

25.SFI bell housing and/or SFI blow proof bell housing or SFI blanket type shield must be used.

26. Water injection is prohibited.

27. Air to Air intercooler only. No cooling device allowed for intercooler. No ice boxes. 

Limited Pro Diesel 4X4 Truck

1. Maximum weight 8000lbs.

2. The OEM chassis is mandatory. The vehicle must retain the full OEM chassis. Wheel tubs, back- half conversions, tube chassis are prohibited. Maximum wheelbase 158" and 102" maximum width (outside tire to outside tire.) Rigid suspension allowed. Hydraulic steering is allowed.

3. The body must be an OEM truck body, including the complete OEM floor pan and must retain complete OEM firewall. Complete bed floor, hitch is allowed to protrude thru the bed floor w/minimum amount of floor removed. No flatbeds permitted. The body must retain the full sheet metal, aftermarket steel hoods are permitted. The hood must be closed and securely latched while hooked to the sled.

4. Maximum engine size will be 460 cubic inch. Engines must come from factory in one ton or smaller diesel pickup truck. Engine must remain in stock location as intended 42

by manufacturer. Engines may be interchanged between manufacturers.

a. No aftermarket blocks permitted

b. Head must be OEM or OEM one piece cast replica for that brand engine. No billet heads of any material. Outside dimensions of cylinder head must measure factory width and length. Head must retain OEM valve angle.

5. Front of engine block can be no farther forward than 17" of center line of front axle.

6. Engine must have cable surrounding block and head. Cable must be minimum 3/8" diameter located between cylinders #1 and #2. Cable must pass thru manifolds. Cable will have 4-6" of slack with a minimum of 4 cable clamps at splice.

7. All engines will have a deflection shield, running the complete length of the block casting. Shield must be securely fastened and must be .060" thick. (This equates to a steel inner fender)

 8. Hook point must be no closer than 44" of center line of rear axle, hitch height maximum of 26", with a minimum of a 3.75" X 3.0" opening. Hitch point must be easily accessed. No "trick" type hitches permitted. Hitch must be stationary in all directions. Hitch must be frame mounted. Hitch must be mounted center line of rear axle or behind. Hitch must not exceed a maximum of 25 angle from pivot point to hook point. No hitch supports or adjusters fastened to the rear axle housing shall be above the centerline of the rear axle. Pivot pin of drawbar can be no farther forward than center line of the rear axle.

9. Secondary hitch required. Minimum of 3/8" steel, located 12" below primary hitch on the same vertical plane. (You should be able to look directly through both at the same time – they need to be lined up.)43

 

10. The turbocharger is smooth faced intake housing, limited to a maximum of 3.0" inlet, (no map ring) with all air entering through the 3.0" opening. Intake wheel must protrude 1/8th inch inside of opening.

 11. Exhaust must exit straight up, with (2) 3/8" bolts mounted in a cross pattern no more than 1" apart as close to the turbine wheel as possible, no more than 6" away from turbine wheel.

 12. Intercoolers allowed. Dumping or draining intercoolers without a catch pan within 100 feet of competition track is prohibited.

 13. Water injection is prohibited. All components must be removed from the truck.

 14. Air shut off must have a cable that goes to the rear of truck operated by the sled operator and also one to the cab of the truck. Kill switch will be securely mounted to the back of the vehicle and have a two (2) inch diameter metallic ring to attach the sled.

15. Fuel Systems: Maximum of one P7100 pump, limited to one plunger per cylinder. The use of multiple high pressure common rail fuel pumps is allowed. Ford Powerstroke engine may utilize a second HPOP. Electronic fuel injection is permitted. A 3-way dump valve mounted before the injection pump is mandatory which can be operated by the driver while strapped in the seat.

16. No fuel lines or tanks permitted inside of truck cab unless securely mounted in marine box.

17. Fuel limited to diesel fuel. No alcohol, nitrous, propane or any oxygen enhancing agents allowed.

18. Must run DOT approved tire. Maximum tire height 35", no studded tires or chains. No alteration to DOT tires allowed. Dual rear wheels are permitted on rear axle only. Maximum of 6 tires.44

 

19. Front weights must be no more than 60" from the center line of the front axle to forward most point and be securely fastened. No weights are allowed in cab of the truck. If weights are located in the bed of truck they are to be securely fastened to the bed of the truck.

20. Drive train will consist of the following: Any front axle, any transfer case and any rear axle. No planetaries permitted.

21. Axle shields are required. Shield to be .060" thickness steel or aluminium. Shield not to be mounted to axle ends or hub bolts. A hole may be cut in one to allow locking in of hubs.

22. No cast iron clutches or flywheels permitted, must be SFI approved. Trucks with automatic transmissions, refer to General Rules.

23. SFI bellhousing blankets and/or SFI blow proof bellhousing required.

 24. All U-joints must be shielded 360 degrees with 3/8" thick aluminium w/1/8" steel liner or 5/16" thick steel. Shield will be 6 inches long minimum and centered on u-joint. Inside diameter of shield will be no more than 2 inches larger than u-joint.

 25. All intermediate shafts between the transmission and transfer case will be totally enclosed in 3/8" aluminium or 5/16" steel, ¼" of shaft may be visible.

26. Fire extinguisher (2.5#) or fire suppression system, Helmets-Snell 90 or better, SFI fire suits, head sock, gloves, shoes, and seatbelts required.

27. All other rules may be found in 4X4 Truck and General Rule sections.




 










 

 

 

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