Note: When performing the following service procedures, use only hand tools to remove and install the fill or drain plugs.

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Remove the fill plug from the transfer case.

Note: When draining the transfer case, make sure that an approved drain pan is used.

3. Remove the drain plug from the transfer case.

Caution: Refer to Fastener Caution in the Preface section.




1. Apply pipe sealant GM P/N 12346004 (Canadian P/N 10953480) to the threads on the drain plug.
2. Install the drain plug in the transfer case and tighten the drain plug to 25 N·m (18 lb ft) .
3. Fill the transfer case to the bottom of the fill hole with the proper fluid. Refer to Adhesives, Fluids, Lubricants, and Sealers .
4. Apply pipe sealant GM P/N 12346004 (Canadian P/N 10953480) to the threads on the drain plug.
5. Install the fill plug and tighten to 25 N·m (18 lb ft)
6. Remove the electrical connector from the speed sensor.



7. Remove the speed sensor and the O-ring from the transfer case.
8. Add 1.0 L (1.06 quarts) of the recommended transfer case fluid through the threaded speed sensor opening. Refer to Adhesives, Fluids, Lubricants, and Sealers .
9. Install the new speed sensor into the transfer case with a new O-ring seal and tighten the right rear speed sensor to 17 N·m (16 lb ft)



10. Install the electrical connector to the speed sensor.
11. Lower the vehicle.