CLASSIFICATION

Class 1 – Top Truck

Class 2 – Modified Vehicles

Class 3 – Production Modified Vehicles

Class 4 – Pro Locker Vehicles

Class 5 – Standard Production Vehicles

 
VEHICLE SPECIFICATIONS

Top Truck Vehicles 

Vehicles competing in the Top Truck Class have to comply with the General Conditions except for the following:

 

  • Any differential or drive train components can be used. (Keeping in mind that the track width for this class starts at 3.5m)

  • Rear-wheel steering is allowed.

  • Independently operated brakes are allowed.

  • Adjustable suspension systems are allowed.

  • Differential locks on both axles as well as Limited-Slip differentials and traction control is allowed.

  • There is no maximum tire size (no paddle or agricultural tyres allowed).

Modified Vehicles

 

Vehicles competing in the Modified Class have to comply with the General Conditions as well as the following specifications:

 

Body

  • The vehicle must have a minimum “cab” width of 1200mm. This size must be maintained for a minimum of 500mm between the 2 axles.

  • A Production Chassis is not required

  • Driver and co-driver must be suitably protected from rotating engine and drive-line components well as hot or pressured fluids.

  • Minimum body panels required are:

  • Bonnet to cover top of engine,

  • Area from pedals to back of seat on side of vehicle must be adequately covered to protect the driver and co-driver.

 

Drive-line

  • The differentials must be from a standard 4-wheel drive production vehicle with a maximum crown wheel diameter of 10.5”.

  • Differentials, gearboxes, transfer cases (if fitted), engines and all axle replacement parts must be from lightweight, standard production vehicles (below 3,500kg GVM) of which a recognised manufacturer has manufactured fifty (50) or more of the same model.

  • The hubs, shafts and differential must be in a straight line for front and rear axle.

  • No independent suspension allowed.

  • Any modifications are permitted on the axles, as long as the axles accept the prescribed differentials.

  • All internal axle components must be interchangeable in a standard production vehicle as described in these regulations (e.g. chrome-moly CV’s).

  • Limited slip, locked differentials or traction control in the front and/or rear axle will not be permitted. Vehicles fitted with lockable differentials may compete in these classes provided that the locking facilities are disabled to the satisfaction of the Scrutineers.

  • The use of a mechanically split transfer case, to achieve rear or front wheel drive only, is allowed. A propshaft-disconnect may also be used to achieve the same function as a split transfer case.

  • Hub-reductions (portal axles) are not allowed.

 

Suspension

Any suspension type is permitted as long as it:

  • Does not manually, or;

  • Does not automatically adjust the pre-set ride height of the vehicle while driving, or navigating an obstacle.

  • The suspension may be mechanically adjusted to adjust the ride height of the vehicle, as long as it is not used while navigating an obstacle. Should a suspension adjustment winch be used to adjust the height, the cable must be disconnected while driving.

  • No hydraulic, pneumatic or electric suspension adjustment is allowed.

Steering

  • Rear wheel steering is not permitted.

  • A full hydraulic steering system is permitted on the front wheels.

 

Brake System

  • A single brake pedal mounted in the driver’s foot-well must be able to operate all brakes. Additionally, a lever operated mechanism/s acting simultaneously on all 4 wheels is allowed.

  • A single hand brake that only brakes both the rear wheels simultaneously can be fitted. Transmission brakes are permitted as hand brakes.

  • Brakes may be upgraded, but brakes operating independently on individual wheels will not be permitted.

  • Line locks (manual or electric) may be installed to lock the rear brakes, equally between left and right. The line locks may not be able to lock the front wheels only under any circumstance.

  • Tyres and wheels

  • Maximum tire size is 35” outer diameter.

 

 

Production Modified Vehicles

 

Body

  • The body is considered to be the exterior of the cab, load bed, doors, bonnet, front/rear fenders, grill, etc.

  • The body of the vehicle shall at all times resemble that of the factory produced vehicle in that any member of the general public would be able to recognize the make and model.

  • Load bodies may be changed or modified provided that a floor panel or lid is fitted as well as sides and back are not less than 150mm high behind the driver’s seat, following the lines of the cab and stretching over the back wheels. The load body must stretch to at least 400mm behind the center of the rear axle.

  • Body parts such as mudguards, bonnets, firewalls and floor panels may be replaced, but not substituted by transparent materials.

  • Wheel-arch flares may be added and mudguards modified to accommodate bigger wheels, taking into consideration that the recognizable shape and profile of the vehicle must be retained.

  • Doors may be removed. Safety nets must be fitted in the absence of the doors and shall comply with the conditions as set out in the General Conditions.

  • The vehicle must have a minimum width of 1200mm, unless the original production vehicle is narrower than 1200mm. The body may be wider at the driver/co-driver compartment.

  • The front of the body shall not start behind the front wheel center line.

  • The proportions of the bonnet, grill and mudguards and/or fenders must be maintained when narrowing the vehicle. A 20% error in proportions will be allowed to accommodate the change in width and or height changes made to the vehicle (E.g. if the proportion of the original grill was 1000mm wide x 500 high and is narrowed to 800mm wide, then the maximum allowable variation on the height change will be 400mm ±80mm).

  • No single-seat vehicles will be allowed. Two seats shall be next to each other as per the intent of a production 4x4.

  • The roof and windscreen of the vehicle may be removed should it have been produced from the factory as a removable part.

  • The vehicle shall remain in a road legal condition at all times.

 

Vehicle Frame/Chassis

  • The chassis of the vehicle shall be defined as the two main longitudinal members that support the body and frame/roll-cage. (Note: If a monocoque vehicle is used as the base vehicle, a chassis from another type of vehicle needs to be fitted)

  • The chassis of the vehicle must be the original chassis from a standard 4-wheel drive production vehicle (no reproduction chassis are allowed) with a GVM not exceeding 3,500kg.

  • The chassis may be lengthened, shortened, narrowed or widened. The front end may not be cut shorter than the center of the front wheel center line and the back end not to be shorter than 400 mm in front of the center of the back axle. (Refer to Figure 2 for explanation)

  • At static ride height, the bottom of the chassis rails shall be no higher than the top of the tire. (Refer to Figure 2 for explanation)

  • A replacement body frame that creates an integral roll cage for the vehicle may be used as long as it complies with the regulations as set out in the Body-Section.

  • The roll cage shall conform to the regulations as set out in the General Conditions.

  • The vehicle must have a fixed length and width and may not be able to articulate.

  • The engine must be mounted onto the chassis.

  • The suspension links must be mounted onto the chassis.

 

Drive-line

  • The differentials must be from a standard 4-wheel drive production vehicle with a maximum crown wheel diameter of 10.5”.

  • Differentials, gearboxes, transfer cases (if fitted), engines and all axle replacement parts must be from lightweight, standard production vehicles (below 3,500kg GVM) of which a recognized manufacturer has manufactured fifty (50) or more of the same model.

  • The engine, gearbox and transfer case (if fitted) combination must be directly connected to the differentials to drive the wheels (no wheel motors or electric/hydraulic drives will be allowed).

  • Any modifications are permitted on the axles, as long as the axles accept the prescribed differentials.

  • All internal axle components must be interchangeable in a standard production vehicle as described in these regulations (e.g. chrome-moly CV’s).

  • The back of the engine-block must be located in front of the furthest-forward portion of the driver's seat.

  • The use of a mechanically split transfer case, to achieve rear or front wheel drive only, is allowed. A prop-shaft-disconnect may also be used to achieve the same function as a split transfer case.

  • Hub-reductions (portal axles) are not allowed.

 

Suspension

  • The original suspension type should be retained. (e.g. Leaf Springs shall remain Leaf Springs, Coil and Shock System to remain Cooil and Shock System

  • The suspension may be modified to accommodate the use of larger tyres. (e.g. Lift Kit)

  • Any suspension type is permitted as long as it:

  • Does not manually, or;

  • Does not automatically

  • adjust the pre-set ride height of the vehicle while driving, or navigating an obstacle.

  • The original suspension type is retained. (e.g. Leaf Springs shall remain Leaf Springs, Coil and Shock System to remain Cooil and Shock System)

  • The suspension may be mechanically adjusted to adjust the ride height of the vehicle, as long as it is not used while navigating an obstacle. Should a suspension adjustment winch be used to adjust the height, the cable must be disconnected while driving.

  • No hydraulic, pneumatic or electric suspension adjustment is allowed.

 

Steering

  • Rear wheel steering is not permitted.

  • A full hydraulic steering system is permitted on the front wheels.

 

Brake System

  • A single brake pedal mounted in the driver’s foot-well must be able to operate all brakes. Additionally a lever operated mechanism/s acting simultaneously on all 4 wheels is allowed.

  • A single hand brake that only brakes both the rear wheels simultaneously can be fitted. Transmission brakes are permitted as hand brakes.

  • Brakes may be upgraded, but brakes operating independently on individual wheels will not be permitted.

  • Pinion brake systems are not permitted.

  • Line locks may be installed to lock the rear brakes, equally between left and right. The line locks may not be able to lock the front wheels only under any circumstance.

  • The hand brake may only be mechanical or hydraulic operated. No electronics (solenoid)

 

Tyres and wheels

  • Maximum tire size is 33” outer diameter.

  • Grooving or other modifications that involve removing material from the tire are not permitted.

 

 

 

 

Pro Locker Vehicles

 

There is no limit to changes or modifications except for the following:

 

  • The vehicles must be roadworthy to the Scrutineers satisfaction.

  • The standard production body shell, including the doors, load body, mudguards and bonnet must be retained, without altering the shape. Reinforcement may be made to these components.

  • Fibre glass panels will be accepted as long as it is 100% replica production replacement panels.

  • The chassis and body shell may be professionally shortened, but not narrowed. The original chassis front end may not be cut shorter than 500mm from front of the center of the front axle and the back end not to be shorter than 500 mm from the back of the center of the back axle. The original spring mountings must still be in place at their original positions.

  • The suspension type may be changed, eg. leaf springs to coil springs. Aftermarket coil-over shock absorbers will be permitted.

  • Bumpers may be removed and replaced with bumpers or bush bars not detracting to the looks and image of the vehicle, to the discretion of the Scrutineers.

  • A body lift kit may be fitted provided that the vehicle retains road-worthiness.

  • Running boards may be removed and guards, to protect the sides and underside of the vehicle, may be fitted.

  • Doors may be removed but must be replaced with a framed door with the prescribed netting and a non-transparent bottom half of equal shape and size as the original full door. The replacement door frame must be fitted with a side-impact bar at hip height and of sturdy construction to the discretion of the Scrutineers.

  • Inner fenders may be modified, and vertical external panels may be modified and wheel arch flares added to accommodate bigger wheels, taking into consideration that the recognizable shape and profile of the vehicle must be retained.

  • Any engine and transmission system and axles from a lightweight standard production vehicle must be used.

  • A power steering may be fitted.

  • Rear and front limited slip and locked differentials are permitted.

  • The use of a mechanically split transfer case, to achieve rear or front wheel drive only, is allowed. A prop-shaft-disconnect may also be used to achieve the same function as a split transfer case.

  • Maximum tire size is 37” outer diameter.

  • Windscreens may be removed.

 

Brake System

 

  • A single brake pedal mounted in the driver’s foot-well must be able to      operate all brakes. Additionally, a lever operated mechanism/s acting simultaneously on all 4 wheels is allowed.

  • A hand brake that only brakes both the rear wheels simultaneously can be fitted. Transmission brakes are permitted as hand brakes.

  • Brakes may be upgraded, but brakes operating independently on individual wheels will not be permitted.

 

 

Standard Production Vehicles

 

 

  • This class caters for stock standard, production vehicles in its original form, with limited modifications allowed.

  • The Suspension needs to be original with no increase in the ride height from its original form.

  • The Tyre size used may not be increased more than the following differences:

    • Overall Diameter – 3,50%

    • Width                     – 20mm

  • Replacement front and rear bumpers, Rock Sliders and Mag Wheels may be fitted