7 1/2 - 8 5/8 Inch Ring Gear

The 7-1/2, 7-5/8 and 8-1/2 inch Eaton locking differential type drive axles incorporate a load limiting feature to reduce the chances of axle shaft damage under high torque engagement conditions. The number of tangs on the inner most disc of the lefthand clutch pack has been reduced, allowing these tangs to shear in the event of a high torque engagement of the locker. When the tangs shear, the lock mechanism is disengaged, which limits the torque transmitted to the axle shafts.
If the load limiting disc shears, the differential will continue to operate as an open differential with some limited slip action of the clutch packs at low torques. No additional differential damage should occur while driving with a sheared load limiting disc. When the tangs shear, the metal is trapped by the splines of the cam plate, thus preventing further damage.
If locking differential will not lock, disassemble and inspect unit as described in overhaul procedures. If torque limiting disc is damaged, left hand clutch plates and wave spring replacement is necessary.