TRX4 Aluminium Knuckle Inner Upgrade TRX4021 for TRAXXAS by GPM  [TRX4021]

Aluminum Inner Knuckle Arms Designed for TRX4

This inner knuckle arm set is built for TRAXXAS TRX4 Trail Crawler platforms to support steering geometry and ensure reliable engagement of internal knuckle gears. Manufactured from 6061 T6 aluminum and refined with a 3D CNC finish, the parts offer precise tolerances and a solid metallic interface compared with stock plastic pieces.

The package supplies inner knuckle components along with stainless steel fasteners to replace original plastic hardware where increased rigidity is desired. Use manual numbers 8252 and 8251 as references when verifying part orientation or sourcing matching service parts.

As an upgrade item the aluminum inners reduce assembly flex and can influence front pinion and spur alignment. After installation, check gear mesh and wheel alignment to preserve smooth gear engagement and consistent steering on technical trails.

Fit these knuckles when you want a metal replacement that holds alignment better and withstands repeated trail use.