This RC-scale outer portal drive housing is intended for Traxxas TRX-4 scale and trail crawler models. The part is a gun metal machined aluminium outer shell designated as a front/rear outer portal housing to replace damaged or aged plastic covers while keeping the portal axle geometry unchanged.
The housing serves as a tough external cover for the portal assembly and helps preserve correct wheel offset and axle alignment when fitted as a direct replacement on compatible TRX-4 portal components. It is useful for builders seeking a metal exterior that resists abrasion and complements other aluminium upgrades on the vehicle.
Installation is suitable for those with TRX-4 servicing experience: remove the wheel and OEM outer housing per normal procedure, swap in the aluminium outer shell, and fasten using the original hardware. Follow Traxxas factory instructions for fastener seating and bearing retention, and confirm all clearances before driving.