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

Precision aluminum lower spur gear case cover

This aftermarket lower spur gear case cover is a CNC-friendly upgrade for the TRAXXAS TRX4 Trail Crawler platform, intended to protect the motor bay and primary spur gear from impact and contamination while maintaining routine service access.

Manufactured from aluminum 6061 T6, the cover increases enclosure rigidity compared with polymer housings and resists deformation under load. The kit is supplied as a 7 pcs set and includes stainless steel round head screws for secure mounting, listed below. Multiple finish options are offered for compatibility with different TRX4 builds.

Installation and practical notes:

• Directly replaces the OEM lower spur gear case cover, preserving gearbox geometry and mounting locations.
• The alloy barrier reduces ingress of debris at the spur and motor interface, mitigating abrasive wear on the spur and pinion during slow, torque-heavy crawling.
• Because the component is rigid, confirm free rotation and clearance around the motor, pinion and any aftermarket ESC or wiring prior to final torque to avoid binding or gear preload.

This GPM aluminum lower spur gear case cover provides a robust, serviceable metal solution for TRX4 owners who want increased structural protection and controlled debris ingress.