This aluminum center gear box serves as a replacement component tailored to owners of Traxxas TRX-4 rigs who want a gun metal finish and a more robust mounting platform for the center drivetrain. It is supplied as an upgrade to help maintain precise centreline alignment and to streamline access for service on scale trail vehicles.
Designed for model-level installation, the item holds the center gear train, provides a solid seating area for bearings and shafts, and resists flex that can change gear mesh under heavy crawling. The gun metal coating provides a subtle look while also protecting the aluminum surface from everyday exposure.
Fitting advice: confirm the TRX-4 centre section mounting points, move over any required bearings or seals from the factory housing, and torque fasteners to the chassis recommended values to prevent misalignment. Consider medium-strength thread locker on metal fasteners when vibration is expected.
Performance notes: this housing does not alter gear ratios, however increasing structural rigidity and improving alignment can lower drivetrain lash and make motor loading more consistent during slow technical crawling.
If you want a metal center housing with a low-key gun metal finish, the JR-TRX423-GU is a practical swap that concentrates on alignment and easier servicing for TRX-4 based trail builds.
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