GM Service Manual Online
For 1990-2009 cars only

Transfer Case Front Output Shaft Speed Sensor Replacement TrailBlazer EXT, Envoy XL, Envoy XUV

Removal Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .

  2. Object Number: 746670  Size: SH
  3. Disconnect the transfer case front speed sensor electrical connector.

  4. Object Number: 746669  Size: SH
  5. Remove the transfer case front speed sensor.

Installation Procedure


    Object Number: 746669  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. Install the transfer case front speed sensor.
  2. Tighten
    Tighten the speed sensor to 17 N·m (13 lb ft).


    Object Number: 746670  Size: SH
  3. Connect the transfer case front speed sensor electrical connector.
  4. Lower the vehicle. Refer to Lifting and Jacking the Vehicle .

Transfer Case Front Output Shaft Speed Sensor Replacement TrailBlazer, Envoy, Rainier

Removal Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the fuel tank shield, if equipped. Refer to Fuel Tank Shield Replacement .

  3. Object Number: 746670  Size: SH
  4. Remove the transfer case front speed sensor electrical connector.

  5. Object Number: 746669  Size: SH
  6. Remove the transfer case front speed sensor.

Installation Procedure


    Object Number: 746669  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. Install the transfer case front speed sensor.
  2. Tighten
    Tighten the speed sensor to 17 N·m (13 lb ft).


    Object Number: 746670  Size: SH
  3. Install the transfer case front speed sensor electrical connector.
  4. Install the fuel tank shield, if equipped. Refer to Fuel Tank Shield Replacement .
  5. Lower the vehicle. Refer to Lifting and Jacking the Vehicle .