TRAXXAS Rear Diff & Upper Bulkhead for XRT 8S / X-Maxx - XRT13KIT by GPM  [XRT13KIT]

Rear drivetrain upgrade overview

This aftermarket assembly targets TRAXXAS large-scale trucks and is catalogued as XRT13KIT from GPM. It bundles the rear differential, differential housing and an upper bulkhead to strengthen the rear driveline against the stresses of heavy loads and repeated jumps on 1/5-1/6 scale off-road rigs.

Key construction notes list 4140 carbon steel for the differential gears with heat treatment for increased torsional durability, and CNC-machined 7075-T6 aluminium for the housings and upper bulkhead to maximise stiffness while controlling weight. The bevel gear specification is 32T with a 10T pinion and module M1.6, information that is valuable when sourcing replacement gearsets or servicing the unit.

Service and setup guidance: the kit is intended for direct replacement of the factory rear diffs and housings where chassis match. On servicing, confirm bearing dimensions and gasket placement from the parts list and verify gear mesh and preload following any changes to lubricant or bearings.

The GPM XRT13KIT is pitched as a durable aftermarket option for the specified TRAXXAS trucks, aimed at hobbyists and mechanics who want improved drivetrain longevity under harsh off-road use.