TRAXXAS XRT 8S Rear Complete Diffs & Upper Bulkhead by GPM XRT13KIT  [XRT13KIT]

Rear diffs and upper bulkhead overview

This is an RC-scale drivetrain replacement kit produced for TRAXXAS large-scale models, supplied as an aftermarket assembly by GPM XRT13KIT. The package groups the rear differential assembly with the rear differential housing and upper bulkhead to address durability where heavy loads and repeated jumps are common on 1/5–1/6 scale off-road trucks.

Key materials called out in the source include 4140 carbon steel for the differential gears, heat-treated for torsional strength and wear resistance, and CNC-machined 7075-T6 aluminum for the differential housing and upper bulkhead to keep stiffness high while controlling mass. The differential bevel gear is listed as 32T with a 10T pinion and module M1.6 in the provided data; these details are relevant when matching replacement gearsets or planning maintenance.

Installation and tuning notes: the assembly is intended to directly replace the factory rear diffs and related housings, so expect bolt-on fitment where model compatibility aligns. When servicing, verify bearing sizes and gasket placement provided in the original parts list, and check gear mesh and preload if you change lubricant or bearings to maintain smooth engagement under heavy loads.

This GPM XRT13KIT assembly is positioned as a rugged aftermarket replacement for specified TRAXXAS large-scale trucks, useful for builders and technicians focused on drivetrain longevity and predictable behavior under repeated heavy-load and jump conditions.