Pennsylvania Antique Tractor Pulling Association


The 2.6 Class is designed for pure pulling full-bodied diesel pickup trucks. The truck

must weight 8,000 lbs. or less with driver.

Safety

• OEM equipment and seat belts.

• Fire extinguishers.

• Helmet.

• All safety shields and blankets as required in class rules.

Ballast

• Ballast is permitted.

• Hanging front weights are permitted but cannot exceed 60” to the furthest most point

of the ballast from the center line of the front axle.

• Ballast may be added in the bed of the truck.

• All ballast must be securely fastened.

Batteries

• The batteries must be securely mounted with a solid hold down.

• 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 hoods are prohibited.

• The hood must be closed and securely latched while the vehicle is hooked to the sled.

• The complete OEM firewall and the OEM floor plan is mandatory.

Brakes

• Front 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

• Optional.

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 at a minimum is mandatory and must be worn.

Drive Shaft Loops

• All trucks must have at least six inch wide u-joint shields around the rear u-joint

constructed of at least 1/4 inch steel or 3/8 inch aluminum that will safely contain the ujoint

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.

Engine

• The engine block must have been available as a factory option on a one ton or smaller

diesel pickup truck.

Exhaust

• All vehicles must be equipped to direct exhaust upward.

• Two 3/8 inch diameter, minimum grade 5 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 is mandatory.

• An on-board fire suppression system is permitted.

Fuel

• The fuel must be pump #1/#2 diesel only.

• Soy/Bio-diesel fuel is permitted.

• Off-road diesel fuel is prohibited.

• Nitrous oxide and propane are prohibited along with other oxygen extenders.

• All system components must be removed from the truck.

Fuel Injection Pump

• Maximum “P” series pump allowed. One plunger permitted per cylinder.

Harmonic Balancer

• All engines turning 4500 rpm and higher must be equipped with a harmonic balancer or

damper meeting SFI Spec 18.1.

• A shield across the frame under the front of the engine shielding the damper and engine

fan area is required.

Helmet

• Drivers of all vehicles must wear a helmet meeting Snell SA2010, SAH2010, SA2015

standards, or SFI Specs 3.1/2010, 31.1/2015, 41.1/2010 or 41.1/2015.

• The helmet must have the appropriate certification sticker affixed inside it.

Hitch

• The hitch must be a receiver-style hitch; reinforcements are permitted.

• Reinforcements must not extend forward of the centerline of the rear axle or to the axle

housing itself.

• 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 3.750 inches inside diameter opening for the

sled hook.

• The hooking point will be measured to the center of the clevis loop.

Interior

• The vehicle must be equipped with one seat for the driver; it must be properly installed.

Rear End

• The rear end must have been an option on a one-ton or smaller pickup.

• Rear axle bolts must be covered by a cap or shield.

Steering

• The vehicle must retain the full, original OEM steering gear.

• Additional stabilizers are permitted.

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 limited straps are permitted.

• Traction bars and devices are permitted.

Suspension Rear

• Rigid or 4-link suspensions are permitted.

• 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 permitted.

Transfer Case

• Non-OEM transfer cases are prohibited.

• The transfer case must have been an option on a one-ton or smaller pickup truck.

Transmission Automatic

• Non-OEM transmissions are prohibited.

• After-market 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 accidently

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 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 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 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.

• After-market internal components are permitted.

• A clutch meeting minimum SFI Spec 1.1 or 1.2 is mandatory on all vehicles.

• All manual 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.

Turbocharger

• The vehicle is limited to a single turbocharger.

• The inducer bore on the compressor housing may be no larger than 2.600”. The inlet

will be measured using a 2.650 plug or internal calipers.

• A stock map with the enhancement (MWE) groove is allowed.

• No MWE groove will be allowed that has a width greater than .250”.

• MWE groove must be inside neck area where intake cover is measured at 2.6.

• 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.

• The driver will be responsible for making the compressor wheel and bore accessible for

Tech Officials to measure bore and inspect the compressor wheel.

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.

• Front dual-wheel spacers may be used only with accompanying positive-offset dually

style wheels.

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