TRAXXAS TRX4 Precision 13T Hardened Pinion TRX4013T by GPM  [TRX4013T]

TRX4 13T Hardened Pinion Technical Overview

This aftermarket 2pcs pinion gear set is intended for TRAXXAS TRX4 Trail Crawler models as a replacement or upgrade component. Both gears are precision machined from hardened steel #45 to improve wear resistance under crawling loads, and the set includes a single 3x3 screw shaft for secure motor mounting.

Engineered to alter final drive without changing the spur, the 13-tooth 32-pitch pinion provides a reliable method to increase low-speed torque or refine crawl gearing. Critical dimensions from the manufacturer include a bore diameter of 3.175mm, tooth spacing of 0.8mm, and a 13-tooth count compatible with standard 32-pitch spur gears used in TRX4 drivetrains. This steel option is specified for scenarios where repeated low-speed tooth contact requires high wear resistance.

Assembly guidance: position the pinion on the motor shaft, set accurate mesh with the spur gear, and secure with the supplied 3x3 screw shaft. Verify backlash, ensure both gears are 32-pitch, and recheck mesh after a short break-in run to confirm consistent engagement.