Sierra Classic 2500 4WD V8-6.0L (2007)
Use only drain and fill plugs that are made from aluminum. Steel or brass plugs are not compatible with the magnesium case.
Install the drain plug.
Tighten the plug to 20 Nm (15 ft. lbs.).
2. Fill the transfer case to the bottom of the fill plug hole with DEXRON III, GM P/N 12378470 (Canadian P/N 10952622).
3. Install the fill plug.
Tighten the plug to 20 Nm (15 ft. lbs.).
4. Install the transfer case shield, if equipped. Refer to Transfer Case Shield Replacement.
5. Lower the vehicle.
