Truck Pull Rules
6200 Lb. Modified Street Stock 4x4 pick up (GAS ONLY)
1. Cast iron blocks only, aluminum intakes ,any cast iron OEM cylinder head permitted. No Pro Stock type cylinder heads, sheet metal, or tunnel ram intakes permitted. No dry sump oiling systems.
2. A 505 cu. In. limit. (Will be checked)
3. 850 cfm max. will be checked with plug. (go-no –go)
4. Open headers permitted, must exit down and back.
5. Engine must be same make as truck and the back side of block must be at least 15” behind the center of front axle.
6. Transmission, transfer case front, and rear end must be OEM, 1 Ton or less.
7. Heavy duty aftermarket drive train parts can be used in OEM housings.
8. Factory frames only, no tube chassis.
9. Traction bars are permitted.
10. Solid or block suspension permitted front and rear.
11. Max. wheel base is 140 center to center. Front weight bracket 60” from center of front axle to furthest point forward.
12. Hitch must be a minimum of 36” from center or the rear axle and a maximum height of 26”.
13. Hitch can be adjustable, but must be stationary in all directions when pulling.
14. Hitch must not be above frame rails, pivot point can be no farther forward than center of rear axle.
15. Hitch must be 3 ¾ x 1” thick.
16. Cab must have factory sheet metal and windows.
17. Must have good solid bed floors.
18. Flat beds are permitted as long as they are factory built or heavier.
19. Fiberglass hoods and hood scoops are permitted.
20. Batteries and fuel tanks must be in stock location or in bed.
21. Any street legal DOT approved tire.
22. Maximum tire size is 36” tall by 16” wide. No cut or sharpened tires allowed.
23. No nitrous or any pressurized fuels.
24. Pump gas or racing gas only, no alcohol or nitro permitted.
25. Drive shaft loops , U- joint shields, blow proof bell housing or transmission blanket , and kill switches are required.
* TRUCKS WILL BE CHECKED AT STAGING AREA FOR SAFTEY EQUIPMENT AND CARBURATOR.
Local Street Stock Semi -
1. Must be Street legal and have valid license plates and insurance.(shown at time of entry)
2. 18 in. hitch height, 48 in. from hitch point to rear of the rear drive (max.)
3. DOT approved tires.
4. All air bags must be inflated when checking hitch.
5. No hanging weights are permitted.
6. Hitches are available for use.
7. No Solid suspensions.
8. Must have OEM injector pump.
9. No club or competition trucks.
Work Stock 4×4 Trucks
The Work Stock (WS) class is designed for daily-driven, on the road pickup trucks (full-bodied diesel pickup trucks). Valid DOT registration and license plates are mandatory. The vehicle may be two or four-wheel drive.
Designation: WS followed by competition number
Weight breaks: 8000 lbs. Weight is with driver
Ballast: Ballast is permitted. Hanging front weights are prohibited. Ballast may be added in the bed of the truck. If used, ballast must be securely fastened to the bed. Final decisions rest with the NADM Technical Department.
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 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. 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.
Fire Extinguisher System: A fire extinguisher system is permitted. It must be securely mounted.
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
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 mountingStreet Equipment: Complete headlight and taillight assemblies (all) are mandatory 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 NADM Technical Department.
Suspension, Rear: An OEM-style suspension is mandatory. Lowering or raising the vehicleheight 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.
Tires: The tires must be DOT street tires. Cut tires are prohibited.
Tow Vehicles: Tow vehicles 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.