TRAXXAS TRX4 Front/Rear Aluminum Gear Box by GPM TRX4012  [TRX4012]

Aluminum front and rear gearbox for TRX4

This GPM aluminum gearbox set is an RC-scale replacement part designed for the TRAXXAS TRX4 platform, intended to secure front differential components, suspension link mounting, and front C-hub interfaces on trail crawler builds. The kit is presented as a one-set upgrade focused on structural steadiness rather than changing gear ratios or drivetrain layout.

The machined aluminum housings replace plastic housings to reduce flex around the front and rear differential areas, helping keep link geometry stable under low-speed crawling loads. Installation requires basic disassembly of the stock front and rear gearbox housings, careful transfer of internal gears and bearings, and reuse of original driveline components. No motor, ESC, or servo changes are implied or 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 for securing the gearbox halves, link mounts, and C-hub attachments as described by the supplier.

For modelers focused on reducing chassis flex at the front and rear diff mounts, this GPM TRX4012 aluminum gearbox provides a durable replacement housing and includes the listed stainless steel screws for reassembly; fitment follows TRAXXAS TRX4 stock layout and requires routine gear and bearing transfer during installation.