HPI Racing 44 tooth Nitro spur gear is constructed of black nylon construction, adapter type spur gear. This will only work on Two-speed transmissions that have the HPI 1st gear adapter type construction. The included gear ratio chart list recommends gears for specific HPI vehicles. This product includes one 44 tooth Nitro spur gear. One gear ratio chart and installation guide.
HPI Nitro Two-speed transmission or heavy duty first gear adapter