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

1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle.
2. Remove the fill plug (6).



3. Remove the drain plug (8).

Note: Ensure that an approved drain pan is used when draining the transfer case.

4. Allow the transfer case to drain completely.

Caution: Refer to Fastener Caution in the Preface section.




1. Apply sealant GM P/N 12378470, (Canadian P/N 10952622), or equivalent to the threads of the drain plug.
2. Install the drain plug (8) and tighten to 25 N·m (18 lb ft).



3. Fill the transfer case to the bottom of the fill plug hole with DEXRON®-III, GM P/N 12346143, (Canadian P/N 10952622).
4. Install the fill plug (6) and tighten to 25 N·m (18 lb ft).
5. Lower the vehicle.