TRAXXAS TRX4 Front and Rear Aluminum Gearbox TRX4012 by GPM  [TRX4012]

Aluminum housings for TRAXXAS TRX4 gearbox upgrades

This GPM TRX4012 aluminum gearbox set is a scale replacement designed for the TRAXXAS TRX4 platform, intended to secure front differential components, provide robust suspension link mounting points, and maintain C-hub interfaces on trail-oriented crawler builds. The kit is supplied as a single upgrade set focused on improved structural rigidity rather than modifying gear ratios or the drivetrain layout.

The machined aluminum housings replace the original plastic cases to limit flex around front and rear differential areas, helping preserve link geometry during low-speed technical crawling. Installation involves disassembly of the stock front and rear gearbox housings, careful transfer of internal gears and bearings, and reuse of factory driveline parts. No changes to motor, ESC, or servo systems are required.

The package information from the source lists included fasteners for mounting and retention: Stainless Steel Cap Head Screw 2.5x14 - 4 pcs, Stainless Steel Flat Head Screw 2.5x10 - 4 pcs, Stainless Steel Flat Head Screw 2.5x6 - 6 pcs. These hardware items are intended to secure the gearbox halves, link mounts, and C-hub attachments as noted by the supplier.

For builders aiming to reduce chassis flex at the diff mounts, the TRX4012 aluminum gearbox offers a stiffer replacement housing and includes the listed stainless screws for reassembly; fitment follows TRAXXAS TRX4 stock layout and requires routine transfer of gears and bearings during installation.