Sierra 1500 2WD V8-5.3L VIN Z Flex Fuel (2006)
5. On axles without a locking differential, remove the pinion shaft.
6. On axles with a locking differential, remove the shaft part way. Rotate the case until the pinion shaft touches the housing.
7. On axles with a locking differential, use a screwdriver, or a similar tool, in order to enter the differential case and rotate the lock (1) until the lock
aligns with the thrust block (2).
