ARRMA Mini Kraton 3S 20CrMnTi Steel + 7075-T6 Alloy Rear Diff 12/30T MAKM1230RS by GPM  [MAKM1230RS]

Precision rear diff designed for Mini Kraton 3S

The GPM assembled rear differential is made for compatibility with ARRMA 1/16 Mini Kraton 3S platforms. It combines heat-treated 20CrMnTi steel gears and a 7075-T6 aluminum housing to improve load tolerance and resist wear under sustained brushless torque. The spiral-cut ring gear profile and hardened surfaces help cut noise and offer smoother torque flow between the 12T input gear and the 30T bevel gears at 0.8 module.

Module and teeth count align with driveshafts that use 2 mm pins; the unit is delivered fully assembled with internal bearings in place. Differential oil is excluded, so fitters should top up with silicone oil tuned to their needs: roughly 50K cSt for front diffs, 30K cSt for rear diffs, and 500K-1000K cSt for center diffs where applicable. Fasteners arrive pre-installed; use a medium-strength thread locker where needed to prevent vibration-induced loosening.

This assembled rear differential is suited to users seeking a precision, long-lived replacement for ARRMA Mini Kraton 3S rear drivetrains, particularly where hardened steel and 7075 alloy components extend service life over stock parts.