Limited Modified 4x4 Trucks Weight: · 6300 lbs. maximum weight with driver. All vehicles must cross the scales prior to participating. · Fuel and water may not be added after crossing the scales – unless the truck is in a pull-off that night. Ballast: · Added weight is permitted. Hanging weights and brackets may not extend more than 195 inches from the centerline of the rear axle. · Trucks with longer wheelbases are welcome to participate and may place weights securely fastened inside the engine compartment, but not inside the cab. Body/Chassis: · Truck exterior must be stock in appearance. · Body and frame must match. No mini truck body or frames (i.e. Ranger, Dakota, s-10). · The complete truck body must have factory sheet metal and factory glass windows. · The cab must have o.e.m. Firewall and o.e.m. Floor for safety. · Bed floor, inner and outer skins must be of o.e.m. Or o.e.m. Replacement material. A truck with no bed floor will be allowed as long as there is 200 pounds of weights located over the center rear axle – these weights must be verifiable. Other design modifications to reduce weight are not permitted. Wooden flatbeds are permitted as long as they are factory built or heavier than factory built. Wooden flatbeds must be preapproved by the Class Rep prior to the first event the truck participates in and will be subject to a weight handicap. · Fiberglass hoods and fiberglass hood scoops are permitted. Fiberglass body panels are not permitted unless they are o.e.m factory parts for the make and model of the truck and used as the manufacturer intended. Frame/Suspension: · Factory 1 ton or less full size truck o.e.m. frames are required. · Altering the frame length is not permitted. · Frame strengthening such as gusseting and ladder bars is acceptable. · No tube frames or homemade frames are accepted. · A solid blocked rear suspension is permitted. · 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 limit straps are permitted. · Traction bars and devices are permitted. · Lift kits are acceptable. If air bags are used valve must be at bag. Wheelbase: · The vehicle must retain the original factory wheelbase (+/- 1”); the wheelbase must be compatible to the body used. Engine: · The maximum cubic inch will be 540 cu.in for gas engines; Alcohol engines limited to 430 cubic inches · Provisions must be made to put on a “seal” on the engine after the truck has been cube checked. · Competitors must be able to have the their engine pumped at any time during the pull season. A 1% variance will be permitted. · Engine must remain in the stock location. · No aluminum engine blocks are permitted unless o.e.m. cast iron blocks only, Aluminium intakes are permitted. · Any cast iron or conventional type aluminium cylinder heads permitted. No pro stock type cylinder heads (i.e. “big chief”, “big duke”, “c-head”, “hemi”, “blue thunder pro stock style heads”, etc.), no billet heads. · No sheet metal, or tunnel ram intakes permitted. · Dry sump oiling systems permitted. · Dominator carbs are permitted. · No turbos, superchargers, injection, efi, split or dual carbs. · One spark plug per cylinder. Swaps between manufacturers are not permitted. · **NOTE: Small block engine under 480 cubic inches allowed any heads Electronic Traction Control: · No electronic traction control devices of any kind are permitted. · Data loggers are allowed Kill Switch: · All trucks must be equipped with a kill switch · Must have a kill switch ring. Fuel and Fuel Tanks: · Gasoline is the only type fuel permitted for 540 cubic inch engines. Gasoline or alcohol for engines 430 cubic inches or less. No oxygen accelerators. Turbo-blue and cam-2 are permitted. e-85 (ethanol) is permitted. · Absolutely no oxygen extenders such as vp113, or q16. no propylene oxide additives or the like. · Fuel tanks must in the stock location or may be in the bed. exception: fuel tanks may also be mounted on the front, but must be completely enclosed within the weight box and not visible. in this case a manual fuel shutoff (ball valve easily accessible from the front part of the truck) is required on the weight box. Nitrous Oxide: · Nitrous oxide is prohibited. · All other oxygen extenders are prohibited. · System components must be removed from the truck. Batteries: · Batteries must be securely mounted; batteries must either be in the stock location or these may be moved into the bed or they may also be mounted on the front, but must be completely enclosed within the weight box and not visible. In this case a manual battery disconnect (easily accessible from the front part of the truck) is required on the weight box. Cooling System: · Radiators must be in the stock location and at least of stock size. Hitch: · The hitch must be stationary in all directions. · The hitch’s height from the ground may not exceed 26 inches. · The length of the hitch measured from the center of the rear axle to the hitch point may be no shorter 27% the length of the hitch measured from the center of the rear axle to the hitch point. · All hitch mounting points must be located below the frame rails. · The area where the hook point is at must be free and clear of any obstructions. · A truck may compete with a reese style hitch or may pull form the bumper as long as it meets the 27% rule. · The hooking point must have a minimum 3.75 inch inside diameter opening. · No lever, pivot, axis, or other types of “trick” hitches are permitted. · No vertical hitches, all hitches must be 33 degrees or less parallel to the ground. · A second hitch is not required in this class. Tires: · Maximum tire size for all trucks will be 35×12.50 as stamped. (metric conversion of this tire size is 315/70 or 315/75). · All tires must carry a d.o.t. number on the side wall, dot number must be easily read from the outside of the tire. · No dual wheels, studded tires, tire chains or any tire not specifically intended for street use are permitted. Use of dirt deflectors is prohibited. Tire Altering: · No cut, altered or sharpened tires are permitted. Brakes: · Front hydraulic brakes are mandatory. Driveline brakes accepted. Driveline: · Transmission and transfer case and front and rear differentials must be o.e.m. and available in a one ton (or smaller) pick-up truck. Driveshaft Loops: * Required on all trucks that will collect points. * Required on all truck that are not licensed for the highway. * Required on all trucks that are not properly inspected for the highway. * Required on any truck that competes more than four times during the year. Trucks must have at least six inch wide u-joint shields around the rear u-joints constructed of at least 1/4 inch steel or 3/8 inch aluminum that will safely contain the u-joint and the ends of each shaft. In addition there will be at least one shaft loop in the middle of the drive 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. Flywheel Shield (Manual Transmissions): * required on all trucks that will collect points. * required on all truck that are not licensed for the highway. * required on all trucks that are not properly inspected for the highway. * required on any truck that competes more than four times during the year. All vehicles equipped with a manual transmission must have a flywheel shield. Applications for which a flywheel shield is not available may use a properly attached 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. Transmission, manual: · non-oem transmissions are prohibited. · A clutch meeting minimum sfi spec 1.1 or 1.2 is mandatory on all vehicles. · All transmissions must be clutch assisted. · Sequential shifters are prohibited. Automatic transmission blanket: * required on all trucks that will collect points. * required on all truck that are not licensed for the highway. * required on all trucks that are not properly inspected for the highway. * required on any truck that competes more than four times during the year. · Must use a properly attached 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. Driver restraint system: · the oem restraint system is mandatory and must be utilized during competition. Helmet: · Motor sport type helmet is required for all drivers of trucks that are not currently licensed, insured and inspected for street use. Firesuit: · sfi approved fire jacket, long pants and leather shoes are required for all drivers of trucks that are not currently licensed, insured and inspected for street use. Engine cube checking: · officials may (at their discretion) use a pump or other means to check cubic inches. · Competitors must have all tools/equipment to comply with cubic inch check at all pulls. · Event operation: · driver’s window must be rolled completely up while competing. · Other windows on the truck may be lowered. · Passengers are not permitted in the truck at any time either in the pits or on the track. Class jumping: · trucks may collect points in both the super street gasoline class and the rwyb class. · Any truck that competes in the super street gasoline division will be restricted from the performance street 4x4 class. * all drivers must have a valid state driver’s license. * trucks in this class do not have to be licensed or inspected or insured. * any street licensed truck that chooses to enter this class must be fully licensed and insured.