TRAXXAS TRX4 TRAIL CRAWLER Aluminum Rear Knuckle Inner Case by GPM TRX4022B  [TRX4022B]

TRX4 Aluminum Rear Knuckle Inner Case

This aftermarket 6pcs rear knuckle inner case is made for the TRAXXAS TRX4 Trail Crawler platform and designed for RC-scale drivetrain stability. Fabricated from 6061 T6 aluminum and CNC machined for consistent tolerances, the parts provide a rigid housing that helps maintain alignment of the inner gears inside the rear knuckle arms during low-speed crawling and technical trail runs.

Functionally, the inner case limits lateral play in the rear knuckle gear stack so the gearbox meshes remain steady under suspension articulation. That stabilizing role helps reduce gear lash and keeps gear teeth engagement more consistent when crawling over uneven terrain on the TRX4 chassis.

Hardware included with this set: stainless steel cap head screw 2.5x8 - 4pcs for securing the inner components. The set is supplied as six aluminum knuckle inner cases to cover the rear knuckle assemblies on the vehicle.

Use these aluminum inner cases where increased rigidity and gear alignment matter for rock crawling and technical trail driving on TRX4 models; they serve as a chassis-level tuning item to reduce drivetrain slop without altering gear ratios.