GPM Racing Steel 13T Pinion Gear - 2pcs Set for Traxxas 1/10 TRX4 (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 3×3 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 3×3 screw shaft. Verify backlash, ensure both gears are 32-pitch, and recheck mesh after a short break-in run to confirm consistent engagement.

This item is compatible with

• TRAXXAS TRX4 Defender Trail Crawler

Compatibility checklist

Confirm the vehicle uses 32-pitch spur gearing, the motor pinion requirement is 13T, and the motor shaft bore measures 3.175mm for a proper fit.

Material and wear considerations

The parts are machined from hardened steel #45, offering improved contact durability for repetitive low-speed crawling where steel-to-steel engagement is preferred.

Best practices for setup

Use a feeler or paper to set gear mesh, tighten the supplied 3×3 screw shaft correctly, and run a short break-in to inspect wear patterns and re-adjust mesh if necessary. Write Product Review Please sign in your account before you can write any review. Sign In Close

Made to order: GPM Racing parts are shipped to us from GPM’s factory, so please allow around 14 days for dispatch.