Sierra 1500 4WD V8-5.3L VIN B HO (2006)
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).
8. Remove the brake drum.
9. Push the flange of the axle shaft in toward the differential.
