These Pinion Kits are exactly what you need to replace a pinion gear in your Sport Gearbox. For complete mounting kits designed to help you switch which type of motor you are using with your Sport Gearbox, please see our Sport Gearbox Motor Mount Kits page.
Sport Gearbox 775 Series Pinion Kit (am-3768):
Sport Gearbox CIM & NEO Motor Pinion Kit (Pre 2025) (am-3771):
Note: This version includes 1 in. long screws for motor blocks shipped pre 2025
Sport Gearbox Kraken Uncut Shaft Pinion Kit (am-5582):
Sport Gearbox CIM & NEO Motor Pinion Kit (am-3771a):
Sport Gearbox Minion Pinion Kit (am-5616):
This thin wall, round, aluminium tubing is great for making arms or pivoting joints. It pairs perfectly with 0.875 in. ID bushings and tube nuts to create a system where box tube can pivot around a fixed tube.