This aftermarket drivetrain replacement is produced for TRAXXAS large-scale models and appears as the XRT13KIT offering from GPM. It combines the rear differential, the differential housing and an upper bulkhead to strengthen the rear end of 1/5-1/6 scale off-road trucks under heavy loads and repeated jumps.
Construction highlights cite 4140 carbon steel for the differential gears with heat treatment to improve torsional strength and wear resistance, plus CNC-machined 7075-T6 aluminium for the differential housing and upper bulkhead to retain stiffness while controlling weight. Gear specifications note a 32T bevel with a 10T pinion and module M1.6; these figures help when sourcing replacement gears or planning maintenance tasks.
Installation guidance: this assembly is intended as a direct replacement for factory rear diffs and housings on compatible chassis. During service, confirm bearing sizes and gasket placement per the parts list and re-check gear mesh and preload after any bearing or lubricant changes to ensure smooth engagement under heavy duty conditions.
The GPM XRT13KIT is offered as a tough aftermarket replacement for the specified TRAXXAS trucks, suitable for model builders and workshops focused on dependable drivetrain performance under demanding off-road conditions.
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