Sierra 1500 4WD V8-5.3L VIN Z Flex Fuel (2005)
2. Fill the transfer case to the bottom of the fill plug hole with Auto-Trak II, transfer case fluid, GM P/N 12378-508 (Canadian P/N 10953626).
3. Install the fill plug.
Tighten
Tighten the plug to 20 N.m (15 lb ft).
4. Install the transfer case shield, if equipped.
5. Lower the vehicle.
