GPM TRAXXAS TRX4 Steel 12T Pinion Gear - TRX4012T - RC Spare Part  [TRX4012T]

Heavy duty 12T pinion for TRX4 crawlers

This aftermarket pinion is a direct-fit option for the TRAXXAS TRX4 Trail Crawler platform, supplied as a two-piece set. Machined from hardened #45 steel, the design suits low-speed, high-torque crawling where durable steel teeth and stable mesh are preferred for long running life.

The pinion secures to the motor using the included 3x3 screw shaft and transmits motor torque into the drivetrain. Critical dimensions provided by the source are a middle hole diameter of 3.175mm, tooth count 12T, pitch spec 32, and tooth spacing of 0.8mm; use these values to check spur and shaft compatibility before fitting.

Installation tip: verify your motor shaft measures 3.175mm and that the spur gear uses a 0.8mm pitch, slide the pinion on, tighten the supplied 3x3 screw shaft, and set gear mesh and endplay on the bench to prevent premature wear during initial runs. This information is focused on compatibility and setup for RC-scale models.