Swap in the GPM differential gear set to strengthen your ARRMA GRANITE drivetrain. The kit uses 4140 carbon alloy steel for the gear teeth and 7075-T6 aluminum alloy for the housings, with a spiral cut ring gear to help smooth power delivery. The large bevel gear (30T) and the front small bevel gear (12T) receive surface hardening to resist wear under heavy loads. The assembly is delivered fully built with bearings and fits as a direct replacement for the factory parts (#ARA311193 + #ARA311182). Differential oil is not included; check the ARRMA manual for the recommended oil weight and filling procedure.
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