TRAXXAS XRT/X-Maxx Rear Differential & Upper Bulkhead Upgrade - XRT13KIT by GPM  [XRT13KIT]

Heavy-duty rear diff and bulkhead summary

This aftermarket drivetrain kit is built for TRAXXAS large-scale trucks and is offered as an upgrade under the model XRT13KIT by GPM. The package combines the rear differential, its housing and the upper bulkhead to improve durability when trucks handle heavy loads and frequent jumps on 1/5-1/6 scale off-road builds.

Materials highlighted in the original data include 4140 carbon steel for the differential gears, heat-treated to resist torsion and wear, and CNC-machined 7075-T6 aluminum for the housing and upper bulkhead to boost stiffness while limiting excess mass. The differential bevel gear is recorded as 32T with a 10T pinion and module M1.6, details useful when matching spare gears or planning maintenance.

Fitment and setup notes: this assembly is designed to replace the factory rear diffs and related housings directly where chassis compatibility matches. During service, confirm bearing dimensions and gasket placement from the parts list, and re-check gear mesh and preload if you alter lubricants or bearings to preserve smooth engagement under heavy duty use.

The GPM XRT13KIT is positioned as a robust aftermarket replacement for the listed TRAXXAS large-scale trucks, aimed at builders and technicians seeking longer drivetrain life and consistent behavior under repeated heavy-load and jump conditions.