Pennsylvania Antique Tractor Pulling Association

The 3.6 Class is designed for pure pulling full-bodied diesel pickup trucks. The truck

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


• SFI driver restraint.

• Fire extinguishers.

• Helmet and protective clothing.

• Fuel and air shut offs.

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


• 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.


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

• They may not be located in the driver compartment.


• The body must be the OEM truck body.

• 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.

• The full bed floor must remain intact. Alternatively, 200 lbs. of movable weight must be

placed rearward of the center line of the rear axle in lieu of the bed floor.


• Front 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.

Cooling System

• Optional.


• Open.

Driver Restraint System

• The OEM restraint system labeled as meeting SFI Spec 16.1 or 1.t is permitted; this

system must be updated at two-year intervals from date of manufacture.

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.

• There will be at least one shaft loop in the middle of the drive shaft.

• On vehicles so equipped, all intermediate drive shafts must be fully enclosed with a 5/16

inch steel or 3/8 aluminum shield.


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

diesel pickup truck.

• No after-market blocks allowed.


• 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.


• 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 Shut Off

• All trucks must be equipped with a driver-operated fuel shut off capable of blocking fuel

flow to the injection pump.

• A three-way dump valve is recommended.

Fuel System

• 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.

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.


• 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.


• 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 center line of the rear


• 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 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.


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

Master Cutoff

• A sled- and driver-operated spring-loaded emergency air shut off is mandatory.

• The cable must terminate into a two-inch diameter steel ring.

Protective Clothing

• Fire suits required with a minimum of SFI 3.2A/1.

• In flip top bodied vehicles without a firewall or working doors, the driver will be

required to wear an SFI 3.2A/5 approved suit.

• Fireproof gloves, fireproof head-stock, and fireproof shoes must meet SFI Spec 3.3.

Rear End

• Axle and hub bolt shield required to be minimum of 0.060” thick.

• Diameter of the axle end and hub bolts to be covered on both front and rear axle.

• A hole may be installed in the center of front shield so hub lock can be operated, so long

as hub end or axle bolts are covered.

Suspension Front

• The axle centerline must remain in factory location.

Suspension Rear

• Rigid or 4-link suspensions are permitted.

• Airbag spring assistance is permitted; airbag compressors must be disconnected.


• 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


• 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.


• The vehicle is limited to a single turbocharger.

• The induce bore on the compressor housing may be no larger than 3.6”. The inlet will

be measured using a 3.650 plug or internal calipers.

• Bushing of any larger turbo size down to a 3.6 turbo is prohibited.

• The turbocharger will have a smooth faced intake housing, limited to a 3.6” intake, (no

map ring) with all air entering through the 3.6” opening.

• Intake wheel must protrude 1/8 inch inside of opening.

• 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 permitted.

• Alcohol, methanol, and all other flammables are prohibited.


• The minimum allowed wheelbase is 90 inches; the maximum allowed is 180 inches.

• The maximum wheelbase variation from left to right is one inch; the measurement will

be made using an X pattern (LF-RR and RF-LR).

• The maximum allowed tread width is 102 inches.

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