TRAXXAS TRX4 Trail Crawler Aluminum Transmission Lower Spur Gear Case Cover by GPM TRX4038GCB  [TRX4038GCB]

Aluminum Lower Spur Gear Case Cover

This aftermarket lower spur gear case cover is an RC-scale replacement designed for the TRAXXAS TRX4 Trail Crawler platform. Its primary role is to shield the motor area and main spur gear from direct impacts and contamination while maintaining access for routine maintenance.

Constructed from aluminum 6061 T6, the cover offers higher tensile strength than typical plastic housings and acts as a rigid barrier around the gearbox opening. The set is supplied as a 7 pcs kit and includes stainless steel round head screws for mounting, listed below. Multiple finish options are provided to match or customize a TRX4 build.

Installation notes and tuning role:

• Mounting replaces the standard lower spur gear case cover to provide a more durable enclosure without changing gearbox geometry.
• The alloy panel helps limit debris ingress around the spur gear and motor, which can reduce wear on the spur gear and motor pinion interface when trail crawling.
• Because the part is rigid, check clearance around the motor, pinion gear, and any aftermarket ESC or wiring before final tightening to prevent binding.

This GPM aluminum lower spur gear case cover offers a straightforward upgrade path for TRX4 owners seeking added protection and a metal finish, while retaining standard mounting points and service access.