TRAXXAS TRX4 Steel 9T Pinion Gear by GPM TRX4009T  [TRX4009T]

TRAXXAS TRX4 9T Steel Pinion Gear

This steel 9T pinion is an RC-scale replacement part produced for the TRAXXAS TRX4 platform and identified as GPM TRX4009T. It is manufactured from hardened steel #45 and designed to meet the mechanical fit and load typical of low-speed crawler drivetrains.

Functionally the gear mounts to the motor shaft and transmits power into the transmission train; it pairs with spur gears of matching pitch and is suited where a 9‑tooth pinion is required to achieve a specific ratio on TRX4 crawlers. The part fits motors that accept a 3.175mm centre bore and a 32 pitch gear profile with 0.8mm tooth spacing.

Installation is straightforward for users familiar with motor and pinion changes: secure the pinion onto the motor shaft using the supplied screw shaft and verify mesh with the spur gear to avoid binding. In tuning terms, swapping to a 9T pinion affects speed versus torque balance and is typically used to increase torque at the wheel for technical, low-speed crawling.