Have you added a 6"+ lift kit on your Ram 2500 4x4? Chances are, your driveline angles are pretty steep and reaching their maximum. When your angles are too steep, driveline vibration can occure, shortening their life span and hurting performance. This indexing kit has a transfer case clocking ring and transmission crossmember to help get your angles back into check. Includes all necessary hardware. 67-1961 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 6”+ lift kits while re-positioning the transmission and pinion position for a smooth driving experience on or off road.