NSPA - The Premiere Sled Pulling Assocition

Overview

Work Stock

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 must be four-wheel drive.

Meduim-Duty Hauler Exhibition

The Medium-Duty Hauler Exhibition (MH/E) class is the same as Work Stock, except that the vehicle must be a medium-duty, rear-wheel or all-wheel drive truck, ballast and hanging weights are prohibited and the transfer case (if any) and rear end must be as supplied by the truck's manufacturer.

Weight Breaks

8,000 lbs weight including driver.

designations

WS followed by competition number

MH/E followed by exhibition number

Regulations

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 NSPA Technical Department. For class MH/E, ballast and hanging weights are prohibited.

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.

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 driver’s license.

Driveline

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

Driver Restraints

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. The engine must be governed to a maximum of 4500 RPM unless the OEM governed speed is higher.

Exhaust

All vehicles must be equipped to direct exhaust upward or downward. The exhaust must exit rearward of the driver's compartment. Stacks exiting through the hood or fenderwell are prohibited. If the muffler or catalytic convert have been changed from stock, two 3/8 inch diameter bolts must be placed through the exhaust pipe in a cross pattern within one inch of each other as close to the turbo as is practical.

Fire Extinguisher

A fire extinguisher system is permitted. It must be securely mounted.

Firewall

The complete OEM firewall is mandatory.

Floor

The complete OEM floor pan is mandatory.

Fuel

The fuel must be pump #1/#2 diesel only. Soy/Biodiesel fuel is permitted. Off-road diesel fuel is prohibited.

Fuel Injection/Constant Perssure 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.

Hitch

The hitch must be a "Reese"-style hitch; reinforcements are permitted. 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 must have a minimum 3.00 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.

Nitrous Oxide

Nitrous oxide is prohibited. No other oxygen extenders are allowed. All system components must be removed from the truck.

Propane

Propane is prohibited. All system components must be removed from the truck.

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. For class MH/E, the rear end must be the model supplied with the vehicle as manufactured.

Steering

The vehicle must retain the full, original OEM steering gear. The vehicle must retain the original OEM power 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. Final decisions rest with the NSPA Technical Department.

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. Sway bars, limit straps, and camber kits are permitted. The rear suspension must maintain a minimum compression shock travel of one inch; compresssion 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. For class MH/E, the transfer case, if any, must be the model supplied with the vehicle as manufactured.

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 tailhousing with a minimum six inch overlap where it is fastened. All non-blanket-type shields must incorporate two (or one, per manufacturer’s 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 bellhousing; 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 make-specific charger only. Vehicles factory equipped with two turbo chargers is permitted. Turbochargers from different years in the same make may be interchanged.

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.