GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the right front tire and wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  3. Remove the power steering pump. Refer to Power Steering Pump Replacement in Power Steering System.
  4. Disconnect the electrical connector from the speed sensor.

  5. Object Number: 630581  Size: SH
  6. Remove the speed sensor / vent hose bolt (3) from the transfer case.
  7. Reposition the pinion housing vent hose (2) and mounting bracket away from the speed sensor bolt boss.

  8. Object Number: 630579  Size: SH
  9. Remove the speed sensor (1).
  10. Remove O-ring from the speed sensor, if necessary. The O-ring may be reused if it is not cut or damaged.

Installation Procedure


    Object Number: 630579  Size: SH
  1. Install the O-ring to the speed sensor, if removed.
  2. Install the speed sensor (1) to the transfer case.

  3. Object Number: 630581  Size: SH
  4. Position the pinion housing vent hose (2) and mounting bracket to the speed sensor bolt boss.
  5. Notice: Refer to Fastener Notice in the Preface section.

  6. Install the speed sensor bolt (3) to the transfer case.
  7. Tighten
    Tighten the bolt to 30 N·m (22 lb ft).

  8. Connect the electrical connector to the speed sensor.
  9. Install the power steering pump. Refer to Power Steering Pump Replacement in Power Steering System.
  10. Install the right front tire and wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  11. Lower the vehicle.