Traxxas 7754R Drive Cup HD (for Steel Driveshaft #7750X) X-Maxx, XRTTraxxas 7754R Drive cup, steel, extreme heavy duty (2) 3x8mm CS, heavy duty (2) (use only with #7750X driveshaft) (machined, heat treated) Give your X Maxx or XRT the toughest driveline possible with these extreme heavy duty drive cups. The drive cups are machined out of high grade heat treated steel to resist rounding out from dogbone contact. Includes 3x8 mm screws (2). Sold in pairs. (Use only with 7750X driveshafts). Accessory part for these