TRAXXAS TRX4 Brass outer portal housings precision heavy set - TRX4021X by GPM  [TRX4021X]

Precision heavy brass portal housings for TRX4 platforms

This heavy brass outer portal drive housing is specified for the TRAXXAS TRX4 platform and is machined from brass to increase rotating mass and axial balance. Each housing contributes approximately 50 grams at the wheel to enhance tyre contact during low-speed crawling and to improve momentum when negotiating shallow obstacles.

The housings are suitable for front or rear portal assemblies and are supplied as a matched set to preserve axle symmetry. The additional rotating mass assists wheel bite in ruts or softer terrain, allowing the vehicle to recover traction and settle back to a neutral stance with reduced oscillation.

Full mounting hardware is provided, including 16 stainless steel flat head screws sized 2.5x8. Installation is a bolt-on replacement for the stock outer portal housings; no core driveline modification is required when following standard TRX4 portal removal and refit procedures. Check torque settings and clearance during installation to maintain drivetrain alignment.

For technical users seeking a robust, direct-fit method to add rotating mass for improved crawl behaviour, this brass outer portal housing set provides balanced weight addition and straightforward installation without altering the core driveline.