The OTC 1978 is designed and built to have the correct clearance for yoke and locknut assemblies on a variety of truck transmissions and differentials. The socket has 3" of usable depth and is 4" long. Using the right tools saves time and effort, eliminating the need to destroy standard sockets by grinding them down to fit tight pinion clearances. Also included in the OTC 9814 Truck Pinion Socket Set.