GPM Racing Aluminium Outer 36 Piece Set RC Portal Drive Housing - GPM-TRX4021A/2

The GPM Racing GPM-TRX4021A/2 aluminium outer portal drive housing is a machined metal upgrade set designed for the Traxxas TRX-4 portal axle system, replacing the stock plastic housings on either the front or rear axles. Portal drive systems take considerable stress during crawling, and swapping to aluminium construction gives the TRX-4 axle ends significantly more resistance to impact and flex. This 36-piece set covers everything needed to complete the outer portal housing assembly on one axle, making it a practical step up for TRX-4 owners who push their rigs hard on rocky or technical terrain.

Key Features

• Machined aluminium construction replaces the stock plastic outer portal housings, improving durability under load and impact
• Suitable for use on either the front or rear portal axle of the Traxxas TRX-4
• 36-piece set includes all the components required to complete the outer portal housing assembly on one axle
• Designed as a direct-fit upgrade — no modifications to the TRX-4 chassis or axle internals required
• GPM Racing part number TRX4021A/2 for straightforward cross-referencing when ordering

What's Included

• 36-piece aluminium outer portal drive housing set (front or rear fitment)

What You Need

• Traxxas TRX-4 RC crawler (sold separately)
• Standard hobby tools for disassembly and installation (e.g. hex drivers, thread lock)