CHALLENGE CLASS
These Specifications must be read in conjunction with those relating to All Classes
1. TYRES
Tyre size is free.
2. WHEELS
Wheel options are unlimited.
Bead locks are allowed.
3. AXLES
Axle housings are free.
Axle internal components are free.
Hubs are free.
4. BRAKES
The braking system may be modified provided that the braking performance of the vehicle meets or exceeds the vehicles original braking performance.
The composition of the brake pads/linings is free.
A secondary or emergency braking system shall be fitted and shall be operational.
5. DIFFERENTIALS
The differential system is free.
Differentials housings may be modified and strengthened.
Differential ratios are free.
6. GEARBOX
The gearbox options are free.
7. TRANSFER CASE
The transfer case system is free.
Transfer case ratios are free.
The transfer case and differentials shall be operative and capable of driving all four wheels.
8. STEERING
Steering boxes are free but shall be securely fastened to the chassis.
Steering linkages and components are free and may have protection fitted to them.
9. SUSPENSION
Selection of shock absorbers and bushes is free including number and location.
The spring configuration and position on the chassis is free.
Control arm configuration is free including arm length and mounting points.
Suspension mounting points may be strengthened.
The axle position is free.
10. ENGINE
Any replacement engine is permissible.
Snorkels and aftermarket air filters are free unless specified otherwise in the Supplementary Regulations.
Oil filters are free except the original method of attachment shall be retained.
11. ELECTRICAL
A battery mechanical isolation switch for the battery that provides power to the engine, ignition and fuel pump shall be securely mounted within easy reach of each member of the crew and this switch may isolate the negative terminal.
Alternators are free.
Headlight inserts and globes are free.
Tail lights, stop lights and reversing lights are free.
12. EXHAUST SYSTEMS
The exhaust system is free.
13. CHASSIS
The original chassis for that make of vehicle shall be used.
Strengthening with the additional bracing is acceptable.
Spring and shock absorber mountings may be strengthened.
Protection plates may be added for strengthening and protection purposes.
14. BODY
The body of the make of the vehicle shall be readily recognised and shall be the same manufacturer as the chassis.
The combination of body and chassis may be updated with body and chassis elements from later models of the same make of vehicle.
Body alterations are permissible to a maximum of 25% of the side profile of the original make of vehicle regardless of model.
The determination of the 25% is based on an area being the portion of the side view that is added or removed from the total area determined by the rectangle of the extreme forward and rearward points, the roof and the ground of the original vehicle.
Body lifts shall be limited to 75mm and shall be completed in a safe and secure manner and the spacers shall be a non-crushable material and the bolts shall be the same diameter as the original body mounting bolts and at least grade 8. There shall be the same number of body mounts and supports as the original chassis and body combination.
Additional mudflaps flares and door sills may be added for protection.
15. LIGHTS
Vehicles may be fitted with any number driving lights in addition to the original headlights and driving lights.
Driving lights shall operate with the high/low beam switch in conjunction with the headlights and shall be fitted in accordance with relevant registration rules.
It is strongly recommended that a dust lamp be fitted to the rear of the vehicle.
16. FUEL
The fuel system is free but shall be in a sound condition with all fittings tightly fastened.
The original fuel tank may be supplemented or replaced with a long-range fuel tank.
Alternative fuel such as LPG may be fitted in accordance with State and National Regulations.
Fuel used shall be limited to that which is available at service stations.