Official 2026 Ultra4 Rulebook requirements for the 4400 Unlimited Class, including engine, drivetrain, steering, suspension, tires and roll cages.
Any and all engines are permitted, providing they meet all the additional rules and regulations specified herein.
Any and all transfer cases are permitted, providing they meet all the additional rules and regulations specified herein.
Any and all driveshafts are permitted, providing they meet all the additional rules and regulations specified herein.
Any and all axle assemblies are permitted, providing they meet all the additional rules and regulations specified herein.
Any and all steering components and configurations are permitted, providing they meet all the additional rules and regulations specified herein. Rear steering is permitted.
Any and all suspension components and configurations are permitted, providing they meet all the additional rules and regulations specified herein.
Shock absorbers of any make/model/type are permitted and may be installed in any location and orientation, providing they meet all the additional rules and regulations specified herein.
Manual suspension controls (e.g., forced hydraulics) are permitted.
Any and all tires are permitted providing they have a minimum outside diameter of 37" (equivalent), as specified on the tire’s sidewall by the original manufacturer and must meet all the additional rules and regulations specified herein.
All vehicles must have a cage that meets or exceeds section 2.6.2 with a minimum tube dimensions of 1.75” (45mm) diameter x.120” (3.0mm).
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