R600: Stock Class 4600 - 4699
Stock
Stock
GENERAL REGULATIONS
Entrants in this class shall comply with all applicable general regulations.
TECHNICAL REGULATIONS
This class is a stock production class. If the rules herein don’t say that you can do it, you CAN’T do it and it will be deemed illegal. All components must remain stock as delivered from the manufacturer unless otherwise stated within. Manufacturer’s body, chassis, engine, transmission, and differentials must be retained. Parts offered for sale from the same OE manufacturer, with an OE part number, for the same model, as dealer-installed accessories, over the counter accessories, or performance parts are considered original equipment. Axles and differentials are open, must remain the same as delivered by the manufacturer, straight axle, IFS, etc.
NOTE: The TR abbreviations listed under this class (I.E. TR1 HELMETS) refer to TR cross reference listings in the front of this book. These TR cross-referenced listings are part of the class rules. Where a conflict occurs between the TR cross-referenced listing and a rule contained under this class, the rule contained under this class takes priority.
SAFETY EQUIPMENT
TR1 HELMETS
TR2 PROTECTIVE CLOTHING
TR3 EYE PROTECTION and DENTURES
TR4 HEAD AND NECK RESTRAINTS
TR5 FIRST AID KIT
TR6 EMERGENCY SIGNALING DEVICES
TR7 HORNS
TR8 REFLECTORS
TR9 FIRE SUPPRESSION EQUIPMENT
TR10 SURVIVAL SUPPLIES
SUSPENSION COMPONENT
Spring rates are open and may be mounted in any location.
Spring spacers are allowed.
Leaf springs must be connected directly to the axle assembly. Links/linkage may be installed, but the leaf springs must be capable of locating the axle assembly relative to the chassis in any direction without the use of any such links/linkage.
Quarter elliptical springs, transverse leaf springs, and the use of double-shackles (at the forward and rear leaf spring mounting points at the chassis) are not permitted.
Front and rear suspension types must remain stock as delivered by the manufacturer. Leaf spring must remain leaf spring. Coil spring must remain coil spring, coil over may be used. All components must be the original manufacturer's design.
A-arms, I-beams, links, and front axles are open.
All suspension components must remain stock design as delivered by the manufacturer.
Rubber bushings may be replaced with bushings of any material.
Stock wheelbase must be retained plus or minus three (3) inches.
TR11 SHOCK ABSORBERS and BUMP STOPS
Maximum one (1) shocks per corner.
Maximum shock body outside diameter 2.65 inches (67mm).
Maximum shock stroke is fourteen (14) inches.
Shocks must mount to chassis and axle only, no linkage mounted shocks allowed.
Position-sensitive shocks (including bypass shocks of all types) are not permitted.
TR12 SECONDARY SUSPENSION
TR13 WHEELS and TIRES
Maximum tire diameter is 37 inches.
Must be DOT.
TR14 FASTENERS
STEERING and BRAKE COMPONENTS
TR15 STEERING
Steering components may be modified or eliminated and steering components/linkage may be installed in any location and orientation. The steering box (or rack, if so equipped) must remain within 4" (100mm) of the stock location.
Mechanical steering linkage mandated.
Rear-steer is not permitted.
Full hydraulic steering is not allowed.
Hydraulic and electric power assist is allowed. Steering must turn wheels lock to lock if the hydraulics are removed.
TR16 BRAKES
Open.
ELECTRICAL SYSTEM
TR17 IGNITION
Open.
TR18 BATTERIES
Open.
TR19 LIGHTS
Stock headlights are required and must be functional.
TR20 STARTERS
Open.
FUEL SYSTEM
TR21 FUEL
TR22 FUEL TANKS
Fuel cell mandatory. All stock fuel tanks must be removed.
TR23 FUEL FILLERS LINES, VENTS, and CAPS
ENGINE, TRANSMISSION and DRIVELINES
TR24 ENGINE and ENGINE DISPLACEMENT
Stock engine must be retained but may be replaced with any available in same make/model/year. Any modifications are permitted. 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.
TR25 ENGINE REPLACEMENT
TR26 TRANSMISSION
Stock transmission must be retained, may be replaced with any available in the same manufacturer/model/year. Any and all modifications are permitted. Stock transmission case/s must be retained, as originally manufactured. Under drives are not permitted.
Transfer case is open, and may be of any manufacturer.
Axles and axle housings are open.
TR27 THROTTLES
TR28 EXHAUST
Open.
TR29 DRIVE SHAFTS
Open.
TR30 FLYWHEEL SHIELDS
TR31 FLUID COOLERS
Radiator size and manufacturer is open.
Radiator must be mounted within six (6) inches of stock location.
TR32 AUXILIARY EQUIPMENT
TR33 SUPERCHARGERS and TURBOCHARGERS
VEHICLE SAFETY EQUIPMENT
TR34 ROLL CAGES
TR35 SAFETY HARNESS
TR36 SAFETY NETS
TR37 SEATING
GENERAL VEHICLE COMPONENTS
TR38 DRIVERS COMPARTMENT
TR39 DOORS AND LATCHES
Stock doors may be modified to create half-doors and/or may also be replaced with tubular doors. Doors must open and close, bolted on panels are not allowed.
TR40 FIREWALLS
TR41 BALLAST
TR42 WEIGHT
TR43 FLOORBOARDS
TR44 BUMPERS and HAZARDOUS PROTRUSIONS
Manufacturer’s bumpers are not required and may be modified or eliminated.
TR45 MIRRORS
TR46 SKID PLATES
TR47 STORAGE
TR48 CHASSIS and BODY
Stock frame (frame is considered to be the primary frame rails and all permanently factory cross members) must be retained and must be complete and unmodified. No material may be removed. The rear portion of the frame and rear cross member may be removed or trimmed for the sole purpose of installing an aftermarket rear bumper. Front of the frame may be cut a maximum of three (3.0) inches to allow for bumper mounting.
Frames may be reinforced by adding material.
Stock body (body is considered to be the full cab, including all interior and exterior sheet metal, bed, doors, hood, fenders, grill, etc.) required. The body 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 roll cage tubes and transmission/transfer case linkage to pass-through the body. Holes may be cut in the firewall, grill and core support exclusively for roll cage. Roll cage includes the main 6-point structure that surrounds and protects the vehicle’s occupants. The roll cage also includes additional tubing designed to protect the structural integrity of the vehicle and its occupants and must be tied to the standard 6-point occupant cage. Open holes must be kept to within .5"(12.5mm) of the diameter of any tube or linkage that passes through the body.
Modifications to the outer fenders must preserve the look of the stock wheel wells, as originally manufactured, and must not be trimmed no more than a 2" (50mm) gap between any part of the outer fender and the tire at full compression.
Front outer fenders may be replaced with OEM-style aftermarket fenders (flared fiberglass fenders are permitted).
Stock body mounts may be modified or eliminated. The relationship of the body to the frame must remain within 1" (25mm) 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 roll cage to pass through the body in order to be securely attached to the chassis.
TR49 HOSES
TR50 IDENTIFICATION MARKINGS
Unlimited Off-Road Racing will assign race numbers.
