Redcat GroundPounder BS702-003 Steering Knuckle, BS702-011 41T Fits all Ground Pounder models BS702-015 Spur Gear 81T, Fits all Ground Pounder models & BS933-001 94.5mm Center Driveshaft Dog Bone (1pc) Most commonly used in the Ground Pounder model from the Differentials out to the wheels, Front/Rear