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

Outer portal housings in brass for TRX4

This product is a brass outer portal drive housing set for the TRAXXAS TRX4 Trail Crawler, listed as model TRX4021X/2. The heavy housings are intended to shift unsprung mass to the wheel ends, changing how the model behaves during technical low-speed crawling and when recovering from soft or irregular ground.

Each outer housing adds about 50 g of mass at the wheel, which increases wheel bite, broadens the effective crawl angle and helps a stuck axle re-establish contact with the surface. The housings fit either front or rear portal positions as specified and are provided as an RC accessory only.

The kit includes stainless steel flat head screws 2.5*8, 32 pcs, for attachment. Fit the housings to a compatible TRX4 portal axle assembly using the supplied hardware and standard hobby tools.

For TRX4 owners seeking a direct way to adjust crawl behaviour, these brass outer housings add wheel-end mass to improve contact and recoverability across low or soft terrain; installation uses standard tools and the supplied 2.5*8 stainless screws.