Associated RC18T Racing-Style Ball Diff AR100S Steel and Aluminium by GPM  [AR100S]

Compact differential for hobby tuning

The AR100S ball differential serves as an aftermarket replacement for Associated RC18T and compatible Latrax machines. Using steel and aluminium parts, it aims to balance durability and lightweight rotating components for model drivetrains.

Precision ball elements and matching thrust washers create controllable differential behaviour. The diff uses a Delrin pulley and aluminium output cups where low friction and low inertia are useful, and ball bearings reduce resistance at key turning points.

Tuning the unit is done through the central screw: tighten to add preload and increase resistance to slip, or loosen to allow freer wheel speed differential. This method makes on-car setup changes quick and repeatable for different circuit conditions.

Builders wanting simple, serviceable differential control for the listed chassis will find the AR100S an effective tuning item for adapting handling to track conditions.