Traxxas TRX-4 Heavy-Duty Outer Portal Housing, Black Aluminum JR-TRX406-BK by Jazrider  [JR-TRX406-BK]

This is an RC-scale replacement outer portal drive housing intended for Traxxas TRX-4 machines and supplied by JAZRIDER as model JR-TRX406-BK. It functions as a front or rear outer portal housing in black anodised-style aluminum for scale and trail crawler use where riders prefer metal replacements to stock plastics.

The aluminium body increases stiffness at the portal mounting face, helping to preserve axle alignment under sustained loads and when using heavier axle or portal gear upgrades. This reduction in flex can improve part life for bearings and axle shafts on demanding courses.

Installation summary: remove the wheel, follow TRX-4 outer housing removal steps, move any internal bearings or seals from the factory part if necessary, then fit the JAZRIDER housing and tighten with your original hardware. Check drivetrain alignment and ensure smooth rotation before final torqueing. Typical hex drivers and basic hand tools are adequate.

Upgrade purpose: intended as a structural enhancement to stabilise portal assemblies. It complements common scale upgrades such as reinforced axles and upgraded dampers to improve on-trail reliability.