Associated RC18T Aftermarket Ball Diff - AR100S Steel+Aluminium by GPM  [AR100S]

Small-scale ball diff for controlled handling

This AR100S ball differential is offered as an aftermarket replacement for the Associated RC18T and compatible Latrax models. Steel and aluminium parts provide strength and reduced mass where needed, intended for model drivetrain use only.

Inside, precision balls and thrust plates produce predictable differential action. The unit uses a Delrin pulley and aluminium output cups to minimise rotating friction, and ball bearings on key axes reduce resistance for smoother spin-up.

Fine tuning is achieved via the centre screw: increasing preload raises resistance to relative wheelspin, while easing the screw allows freer differential operation. This permits simple trackside adjustments to suit surface grip and driving style.

For hobbyists running these platforms, the AR100S is a practical option to alter handling through preload tuning while remaining easy to service.