TRAXXAS TRX4 Steel 12T Pinion Gear - TRX4012T by GPM  [TRX4012T]

Precision 12T steel pinion for TRX4 applications

Engineered as an aftermarket upgrade for the TRAXXAS TRX4 Trail Crawler platform, this 12T pinion is produced for hobbyists seeking a robust steel option. The component is supplied as a pair and is machined to deliver repeatable tooth engagement under crawling loads while maintaining dimensional accuracy for straightforward fitment.

The pinion fastens to the motor via the included 3x3 screw shaft and transmits torque into the drivetrain. Source dimensions are a center bore of 3.175mm, 12T tooth count, pitch 32, and tooth spacing of 0.8mm; these values should be used to confirm spline and spur compatibility before installation to ensure correct alignment and longevity.

Professional fitting advice: confirm motor shaft diameter of 3.175mm, match the 0.8mm pitch spur, fit the pinion and secure with the supplied 3x3 screw shaft, then set precise gear mesh and measure endplay on the bench. Proper initial setup reduces noise and wear and ensures predictable torque transfer in low-speed, high-torque crawling scenarios.