GM Service Manual Online
For 1990-2009 cars only

If your vehicle has this feature, there is a label on the headliner above the windshield or in another place near the driver that shows how to use it. Be sure to follow the directions carefully.

Use the following directions based on the type of shift control the vehicle has.


Object Number: 808267  Size: A3

The rear axle shift control switch for a manual transmission is located on the shift lever.

When the switch is down, the rear axle is in the high range. When the switch is up the rear axle is in low range. Push or pull the switch to change the range.

The two-speed axle control should be in the up position or low range when the vehicle is parked. Engage the transmission and move the vehicle a little to assure the axle is in the low range.

To park the vehicle:

  1. Apply the parking brake. See Parking Brake for parking brake apply procedure.
  2. Shift into NEUTRAL for a manual transmission or PARK (P) for an automatic transmission.
  3. Shut off the engine.

Also, always start the vehicle in motion with the two-speed axle in the low range.

To shift up from low to high, do the following:

  1. Move the switch down for the high range.
  2. Disengage the clutch.
  3. After a brief pause, engage the clutch and then press down on the accelerator pedal until the axle engages.

To shift down from high to low, do the following:

  1. Release the accelerator and move the switch upward for low range.
  2. Press the accelerator pedal slowly until the axle engages.