For those not on FB:
STOCK CLASS
ELIGIBLE VEHICLES
1: Any and all four-wheeled, four-wheel-drive automotive based production vehicles are eligible for competition, provided at least 1000 units were produced by the manufacturer.
FRAME & BODY
2: Stock frame (frame is considered to be the primary framerails and all permanently factory crossmembers) must be retained.
3: Stock body (body is considered to be the full cab, including all interior and exterior sheetmetal, bed, doors, hood, fenders, grill, etc.) required. Must be complete and unmodified, with the following limitations and exceptions: Holes may be cut in any part of the body for the single and exclusive purpose of allowing rollcage tubes and transmission/transfer case linkage to pass-through the body. Stock doors may be modified to create half-doors and/or may also be replaced with tubular doors.
4: Stock windows (glass) are not required, but are permitted, providing they meet DOT regulations.
5: Front inner fenders must be complete and unmodified, with the following limitations and exceptions: outer fenders (wheel well openings) may be trimmed for the single and exclusive purpose of allowing for tire clearance. Modifications to the outer fenders must preserve the look of the stock wheel wells, as originally manufactured, and must not be trimmed excessively (no more than a 2" gap between any part of the outer fender and the tire at full compression).
6: Front outer fenders may be replaced with OEM-style aftermarket fenders (flared fiberglass fenders are permitted). “Flat Style” fenders are permitted.
7: Rear inner and outer fenders must be complete and unmodified, with the following limitations and exceptions: outer fenders (wheelwell openings) may be trimmed for the single and exclusive purpose of allowing for tire clearance. Modifications to the outer fenders must preserve the look of the stock wheelwells, as originally manufactured, and must not be trimmed excessively (no more than a 2" gap between any part of the outer fender and the tire at full compression).
8: Stock body mounts may be modified or eliminated, with the following limitations and exceptions: The relationship of the body to the frame must remain within 2" of stock configuration, as originally manufactured. Stock body mounts shall not be modified or eliminated for any reason other than to allow any part of the rollcage to pass through the body in order to be securely attached to the chassis.
9: Factory head/taillights required, and must be functional.
10: Factory bumpers are not required, and may be modified or eliminated.
11: Stock engine must be retained, but may be replaced with any available in make/model/year. Any and all modifications are permitted, with the following limitations and exceptions: Stock engine-block must be retained, as originally manufactured (boring, stroking and other internal engine modifications are all permitted). Forced-induction of all types is not permitted, unless factory-equipped.
12: If equipped with a water-cooled engine, the radiator must remain within 6" of the original location, as originally manufactured.
TRANSMISSION
13: Stock transmission must be retained, but may be replaced with any available in make/model/year. Any and all modifications are permitted, with the following limitations and exceptions: Stock transmission case/s must be retained, as originally manufactured. Auxiliary transmissions (e. g. secondary transmissions, under / over-drives, etc.) are not permitted.
TRANSFER-CASE
14: Any and all transfer-cases are permitted.
DRIVESHAFT
15: Any and all driveshafts are permitted.
AXLES
16: Any and all axles are permitted.
STEERING
17: Steering components may be modified or eliminated and steering components/linkage may be installed in any location and orientation, with the following limitations and exceptions: All vehicles must retain some type of mechanical steering linkage (e. g. 'full-hydro' steering is not permitted, unless factory-equipped), and said linkage must be capable of controlling the direction of the steering wheels/tires without the benefit of any additional power-steering aids. The steering box (or rack, if so-equipped) must remain within 4" of the stock location. No part of the steering linkage shall be oriented so as to be partially or substantially parallel to the framerails or any part of the suspension linkage, with the exception of the drag-link and track-bar (if so-equipped, and unless otherwise-equipped, as originally manufactured). Rear-steer is not permitted.
SUSPENSION
18: Wheelbase must remain within 6” of stock, as originally manufactured.
19: Suspension configuration must remain stock, as originally manufactured (meaning that leafsprings must remain leafsprings, coilsprings must remain as coilsprings, torsion-bars must remain as torsion-bars, etc.).
20: Leafsprings may be replaced with any leafsprings and may be installed in any location and orientation, with the following limitations and exceptions: Leafsprings must be connected directly to the axle assembly, unless otherwise factory-equipped. Links/linkage may be installed, but the leafsprings must be capable of locating the axle assembly relative to the chassis in any direction without the use of any such links/linkage. As such, quarter-elliptical springs, transverse leafsprings, and the use of double- shackles (at the forward and rear leafspring mounting points at the chassis) are not permitted, unless factory-equipped.
21: Coil-springs and related suspension linkage may be modified or eliminated and replaced with any coil- springs and linkage, and may be installed in any location and orientation, with the following limitations and exceptions: Coil-springs must be connected directly to the axle assembly and chassis and shall not be mounted in any way so as to yield any type of mechanical advantage, unless factory-equipped. Coil- springs shall not be replaced with any type of coil-over shocks, unless factory-equipped (if so-equipped, factory coil-over shocks may be replaced with aftermarket coil-over shocks).
22: Secondary suspension is not permitted, unless factory-equipped (secondary suspension is considered to be any means or method of supporting any portion of a vehicle's weight and/or affecting the primary spring-rate at any time). As such, springs of all types, airbags, air-shocks and air/nitrogen-charged hydraulic bumpstops are not permitted. Compressible bumpstops made of rubber, foam, or other similar materials are permitted, with the following limitations and exceptions: Bumpstops shall not have any effect whatsoever on any aspect of a vehicle's performance outside of the last 2" of vertical wheel-travel (on compression).
23: Shock absorbers of any make/model/type are permitted and may be installed in any location and orientation, with the following limitations and exceptions: Only one shock absorber is permitted per wheel/tire (not including spare tires). Shock absorbers shall not be larger than 2.5" in diameter (outer diameter of shock-body) and shall not be capable of any more than 14" stroke. Shock absorbers must be connected directly to the axle assembly and chassis and shall not be mounted in any way so as to yield any type of mechanical advantage, unless factory-equipped (mounting shock absorbers off-vertical is permitted and shall not be considered a mechanical advantage).
WHEELS & TIRES
24: Tires must be DOT-approved, with a maximum outside diameter of 37" (or equivalent), as specified on the tire’s sidewall by the original manufacturer.