TRAXXAS TRX4 Front/Rear Precision Aluminium Gearbox TRX4012 by GPM  [TRX4012]

Precision aluminium gearbox shells for TRX4 front and rear

The GPM TRX4012 aluminium gearbox set is a scale replacement tailored to the TRAXXAS TRX4 chassis, engineered to strengthen front differential mount areas, provide firm suspension link attachment points, and preserve C-hub interfaces for crawler builds. The product is positioned as a structural upgrade and does not change gear ratios or drivetrain configuration.

These machined aluminium housings reduce chassis flex where the diffs mount, helping to maintain accurate link geometry under low-speed crawling loads. Installation requires removal of the stock front and rear gearbox housings, transfer of internal gears and bearings into the new cases, and reassembly using original driveline parts. There is no requirement to alter motor, ESC, or servo components.

According to the supplier, the package includes the following fasteners: 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 fasteners are intended to secure the gearbox halves, link mounts, and C-hub attachments as specified.

For modellers wanting a firmer front and rear diff mounting solution, the TRX4012 aluminium gearbox reduces housing flex and includes the listed stainless screws; fitment follows the TRX4 stock arrangement and requires standard gear and bearing transfer steps during installation.