GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 Sonoma Pickup - 4WD 🢒 Driveline/Axle 🢒 Transfer Case - NVG 136-NP4 (One Speed Automatic) 🢒 Transfer Case Motor/Encoder Replacement

Removal Procedure

    Object Number: 707039 Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    2. Object Number: 648014 Size: SH
  2. Remove the transfer case shield. Refer to Transfer Case Shield Replacement .
  3. Remove the motor/encoder electrical connector.

    4. Object Number: 648008 Size: SH
  4. Remove the motor/encoder mounting bolts.

    5. Object Number: 651492 Size: SH
  5. Remove the motor/encoder assembly.

    6. Object Number: 648015 Size: SH

    Important: The motor/encoder gasket does not have to be replaced if the motor/encoder is being removed from the transfer case for other service procedures. Replace the motor/encoder gasket only if damaged. If the motor/encoder is being replaced, a new gasket will come with the replacement motor/encoder.

  6. Remove the motor/encoder gasket from the transfer case.
  7. Remove the motor/encoder from the transfer case.

Installation Procedure

    Object Number: 648015 Size: SH
  1. Install the motor/encoder gasket to the transfer case.

    2. Object Number: 651492 Size: SH

    Important: Make sure that the motor/encoder aligns with the detent on the transfer case.

  2. Install the transfer case motor/encoder assembly.

    3. Object Number: 648008 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.

    Important: Before installing the motor/encoder mounting bolts, make sure that the motor/encoder is flat against the transfer case.

  3. Install the transfer case motor/encoder mounting bolts.

    4. Tighten
    Tighten the transfer case motor/encoder mounting bolts to 20 N·m (15 lb ft).


    Object Number: 648014 Size: SH
  4. Install the transfer case motor/encoder electrical connector.

    5. Object Number: 707039 Size: SH
  5. Install the transfer case shield. Refer to Transfer Case Shield Replacement
  6. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.