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

Brass outer portals tailored for TRX4 crawlers

This set supplies brass outer portal drive housings intended for the TRAXXAS TRX4 Trail Crawler, identified by model number TRX4021X/2. The heavy-option housings increase unsprung weight at each wheel to influence vehicle behaviour during technical crawls and when negotiating low or irregular surfaces.

Operationally, each housing adds roughly 50 g of mass at the wheel end, which helps stabilise tyre contact, expands workable crawl angles and assists an axle that has lost contact to find purchase again. The components fit either front or rear portal positions as required and are sold only as RC parts.

Hardware supplied includes stainless steel flat head screws 2.5*8, 32 pcs, for secure assembly. Fitment uses routine hobby tools and the supplied fasteners to mount the housings to compatible TRX4 portal axle assemblies.

For TRX4 users looking to tune crawl behaviour, these brass outer housings offer a straightforward weight-based adjustment to improve wheel contact and recoverability on soft or uneven ground; standard tools and the included 2.5*8 screws are required for installation.