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Draining & Refilling

WARNING: This page is about a different car, the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: When performing the following service procedures, use only hand tools to remove and install the fill or drain plugs.
  1. Raise and support vehicle.
  2. Remove filler plug located on rear of transfer case.
    NOTE: When draining transfer case, make sure that an approved drain pan is used.
  3. Remove drain plug from bottom of transfer case. Allow fluid to drain. See Fig 1.
    Fig 1: Identifying Transfer Case Drain Plug
    G00211843Courtesy of GENERAL MOTORS CORP.
  4. Replace drain plug, apply pipe sealant (P/N-12346004) to the threads on the drain plug. See Fig 1. Tighten drain plug to specification. See TORQUE SPECIFICATIONS .
  5. Fill transfer case through oil filler plug hole to specified capacity using recommended fluid. See RECOMMENDED FLUIDS . Ensure fluid is level with bottom edge of filler plug hole.
  6. Install the fill plug. Apply pipe sealant (P/N-12346004) to the threads on the fill plug. Tighten to specification. See TORQUE SPECIFICATIONS .
  7. Disconnect the electrical connector from the speed sensor.
  8. Remove the speed sensor and the O-ring from the transfer case.
  9. Add 1.0 Liter (1.06 quarts) of DEXRON®VI fluid, P/N 88861003 (in Canada, P/N 88861004) through the threaded speed sensor opening.
  10. Install the speed sensor into the transfer case with the new O-ring seal. See TORQUE SPECIFICATIONS .
  11. Connect the electrical connector to the speed sensor.
  12. Lower the vehicle.
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