GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 GMC C Sierra - 2WD 🢒 Driveline/Axle 🢒 Transfer Case - NVG 263-NP1 (Selectable) 🢒 Transfer Case Adapter Replacement

Removal Procedure

    Object Number: 652614 Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Remove the transfer case assembly. Refer to Transfer Case Assembly Replacement .
  3. Support the transmission with a suitable jack stand.
  4. Remove the transfer case adapter mounting bolts.
  5. Remove the transfer case adapter assembly.
  6. Remove the transfer case adapter seal.

    7. Object Number: 654219 Size: SH
  7. Remove the gasket from the transfer case.

Installation Procedure

    Object Number: 709077 Size: SH

    Important: Always use a new gasket and seal for the adapter. Do not use any type of sealant or adhesive in place of or with the gasket or the O-ring.

  1. Install the new transfer case adapter seal.

    2. Object Number: 709158 Size: SH

    Important: The transfer case adapter must be installed so that the adapter is evenly seated to the transmission before installing the retaining nuts.

  2. Install the transfer case adapter.

    3. 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.

  3. Install the transfer case adapter mounting bolts.

    4. Tighten
    Tighten the transfer case adapter mounting bolts to 50 N·m (36 lb ft).


    Object Number: 654219 Size: SH

    Important: When installing the gasket to the adapter, make sure that the yellow printing on the gasket is facing toward the transfer case (away from the transmission). The locating tab on the gasket should always be pointing to the top of the transfer case.

  4. Install the new transfer case gasket.
  5. Install the transfer case assembly. Refer to Transfer Case Assembly Replacement .
  6. Check the fluid level of the transfer case. Refer to Transfer Case Fluid Replacement .
  7. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.