2017-2022 Ford F250/F350 HD 4WD transfer case clocking ring and transmission crossmember kit. Includes all necessary hardware. 67-20800 addresses that inherent driveline system issue with the addition of a heavy-duty transfer case clocking [indexing] ring and new transmission crossmember. This Driveline Indexing System (DIS) combination works great with our ReadyLIFT big lift kits while re-positioning the transmission and pinion position for a smooth driving experience on or off road.