ARRMA Mini Kraton 3S Rear Gear Differential 12T/30T 0.8mod MAKM1230RS by GPM  [MAKM1230RS]

Drop-in rear differential for Mini Kraton 3S installs

This GPM rear differential assembly is a direct-scale replacement designed for ARRMA 1/16 Mini Kraton 3S platforms. The unit couples heat-treated 20CrMnTi steel gearing with 7075-T6 aluminium housing components to increase load resistance and long-term wear life in high-torque brushless applications. Spiral-cut ring gear geometry and hardened surface treatment help cut noise and provide smoother torque transfer through the 12T input and 30T large bevel gears at 0.8 module.

The module and tooth counts match driveshafts that use 2 mm pins, and the unit is supplied fully assembled with internal bearings fitted. Differential fluid is not supplied, so add the appropriate silicone oil for setup: recommended starting points are 50K cSt for front diffs, 30K cSt for rear diffs, and 500K-1000K cSt for centre diffs when applicable. Fasteners are pre-installed but it is sensible to use a medium-strength thread locker on key screws to avoid loosening under vibration.

Fit this assembled rear differential as a robust, drop-in option for ARRMA Mini Kraton 3S rear drivetrains, particularly where hardened steel and 7075 alloy parts are required to withstand higher loads more reliably than stock components.