TRAXXAS TRX4 Brass Outer Portal Housing TRX4021X/2 by GPM  [TRX4021X/2]

Brass outer portal housings engineered for TRX4 use

This RC brass outer portal drive housing set is intended for the TRAXXAS TRX4 Trail Crawler and carries model number TRX4021X/2. The heavier housings are designed to move unsprung mass to the wheel ends, providing a predictable change in crawl dynamics and aiding recovery on low or inconsistent surfaces.

Each outer housing adds approximately 50 g at the wheel, increasing inertia to help maintain tyre contact, broaden effective crawl angles and assist an axle in regaining ground contact. The housings are suitable for front or rear portal positions as required and are supplied for RC use only.

Fastening hardware supplied consists of stainless steel flat head screws 2.5*8, 32 pcs. Install the housings using the included screws and standard hobby tools to the compatible TRX4 portal axle assembly.

For technical users seeking a weight-based approach to tuning crawl performance, these brass outer housings offer a durable, precision-fit upgrade that increases wheel-end mass for improved contact and recoverability; fitting requires the supplied 2.5*8 stainless screws and standard hobby tools.