A machined aluminum center gear box designed as a replacement part for Traxxas TRX-4 owners who want a subdued gun metal look and a stiffer mounting point for the center drivetrain. It is supplied as a straightforward upgrade to help keep the center gears aligned and to simplify routine service on scale and trail crawler builds.
The unit is intended for model use and its primary function is to secure the center gear train, provide a stable mounting surface for bearings and shafts, and resist distortion that can upset gear mesh during demanding crawling or trail driving. The gun metal coating provides a neutral appearance and adds resistance to surface corrosion on the aluminum body.
Installation notes: verify the TRX-4 center section fitment, move any necessary bearings or seals from the stock housing into this aluminum unit, and torque the mounting screws to the chassis manufacturer recommended values to avoid introducing misalignment. Apply a medium-strength thread locker on metal-to-metal fasteners if your setup sees heavy vibration.
Tuning impact: this housing does not change gear ratios, but increasing casing rigidity and improving alignment can reduce drivetrain lash, improve steering feel, and stabilise motor load during slow technical crawling.
For builders wanting a metal center housing with a muted gun metal finish, this JR-TRX423-GU provides a simple replacement focused on alignment and serviceability for TRX-4 based trail rigs.
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