6 Cylinder Jeep Class Rules

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Attire Requirements

• SFI 3.2 fire suit
• SNELL or SFI approved racing helmet.

Vehicle Safety Requirements

• ALL glass must be removed from vehicle. (windows/ windshield/ back-glass)
• Racing seats (stock seats are not permitted)
• SFI approved window net.
• SFI approved 5-point harness.
• SFl approved fuel cell.
• Batteries must be securely mounted in a battery box.
• A main "kill switch " must be mounted on the driver side rear of the vehicle.
• A rear-facing white light must be mounted for dust visibility.
• A charged fire extinguisher must be mounted within reach of the driver.
• Front and rear driveshaft loops are required.
• Two throttle return springs are required.

Cage Requirements 

• Full roll cages with a 6-point minimum are required.
• The main cage tubing must be a minimum of 1 5/8" outside diameter and 0.120 wall thickness. (Diagram A)
• Must have an X brace behind the driver in the rear hoop. (Diagram A
•  An X-brace OR two horizontal bars are required in the door. (Diagram A)
• Two down bars from the main hoop are required. (Diagram A)
• On full framed vehicles - the cage must attach to the frame, not the body. (Diagram B)
• On unibody vehicles- the cage must be welded to a minimum of a 3/16" plate that is sandwiched between the body and the frame. (See diagram B)

Body/Chassis/Frame

• All bodies must remain stock. (Tubs and unibodies)
• Permitted Models: CJ, YJ, TJ, LJ, XJ, ZJ, WJ, MJ.
• No removing or cutting of the body is permitted, EXCEPT where attaching the following: Where mounting the fuel cell/ the cage to the frame/ the shocks to the cage. *The amount of body being removed must be kept to a minimum to retain as much of the structural integrity intact as possible.
• Trimming of the fenders is permitted if the inner fenders remain fully intact.
• Fender flares and fiberglass fenders are permitted.
• All unibody Jeeps are required to keep all doors and the hatch attached.
• Full frame Jeeps can remove the doors and top ONLY if they are replaced with a minimum of 16-gauge steel for safety. (See diagram A)
• All aftermarket or fabricated bumpers are permitted but must have rounded edges. Any bumper with sharp edges that could potentially puncture a tire are not permitted.
• On all CJ, TJ, LJ, YJ: The full steel tub must be kept intact.
• On all MJ/Comanche: The full bed and cab must remain intact.
• Short wheelbase Jeeps only & Wheelbase must be stock within +/- 2 in.
• The frame must remain stock. (Cutting to lengthen the wheelbase or gain suspension travel is NOT permitted)

Suspension/Steering

• Max track width of 77 inches, from outside of wheel to outside of wheel.
• Front and rear wheel travel is limited to 10 inches.
• Long travel kits are NOT permitted. (Must retain all stock suspension pivot points.)
• Bypass shocks of any type are NOT permitted. (Internal or external)
• Two shocks per wheel are permitted, with a max of 2 3/4" body.
• Rubber or Urethane bump stops only. (Hydraulic bump stops are NOT permitted.)
• Coil and leaf springs are permitted, but the mounting points CANNOT be altered.
• All stock axle brackets must remain intact. (Material may be added to strengthen/ gusset, but the control arm mounts, and coil pads must remain intact.)
• Control arms can be purchased or fabricated, but they must remain at stock length.
• Limit straps are permitted but not mandatory.
• Steering must remain stock. Hydraulic steering is NOT permitted.

  Tires/Wheels/ Brakes

• Maximum Tire Size is 33 inches.
• Maximum Wheel Size is 17 inches.
• Must have a properly operating 4-wheel brake system.
• Must run the stock (OEM) brakes that came from factory.
• Steering brakes are permitted ONLY on the rear axle.

Drivetrain/Transmission

• Straight axles that are permitted: Dana 30, 35, 44 only. (No Ford 9 in. or 8.8)
• Aftermarket axles are permitted, but they must be stock replacements with factory style brackets.
• Stock Jeep transfer cases that are permitted: NV231, NV242, NV249, NV247, Dana 300, Dana 20.
• The Jeep can be either 2WD or 4WD. *
• Only stock transmissions are permitted. (Automatic or manual)
• Each model must be kept in the factory configuration that was originally available for that model.

Engine/Fuel System

• Inline 4 cylinder or inline 6-cylinder engine: 2.5-liter, 4.0-liter, and 258/232 cubic inch.
• All engines must run the stock fuel/injection system it was built with from the factory. *For example, a CJ must run with a carburetor and factory ignition (no MSD). A ZJ must run with OEM EFI (no carburetor).
• Aftermarket fuel injection systems or programmers are NOT permitted.
• Only stock intake manifolds, throttle bodies, and carburetors are permitted.
• All injectors must be stock size and fit in the fuel rail with no modifications to the rail and or wiring.
• Stroker kits, aftermarket heads, or cylinder modifications are NOT permitted.
• Engines must remain in the original location.
• Engines may only be bored to 0.60 for rebuilding,
• Radiators may be relocated to the rear of the vehicle, but the lines must be shielded for drivers’ protection.