GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 GMC C Sierra - 2WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Output Flange/Yoke Replacement

Removal Procedure

    Object Number: 659007 Size: SH
  1. Place the transmission in the Park (P) selector position.

    2. Caution: Apply the parking brake and block the drive wheels before performing this procedure in order to prevent bodily injury.

  2. Apply the parking brake and chock the wheels to prevent vehicle movement.
  3. Remove the vehicle driveline from the transmission yoke assembly (1). Refer to Transmission Replacement .

    4. Remove the bolt (3) and seal-ring washer (2).

  4. Remove the yoke assembly (1).

    5. Important: Do the following prior to installation of the yoke assembly:

       • Be sure the yoke, output shaft and retaining hardware are clean.
       • Verify the output seal is free of tears or cuts.
       • DO NOT attempt to remove scratches from the output seal journal on the yoke assembly. Repair may produce machine lead and leakage.

  5. Inspect the yoke assembly and replace it whenever there are nicks or scratches on the seal journal or on the lead-in chamfer just ahead of the seal journal.

Installation Procedure

    Object Number: 659007 Size: SH
  1. Lubricate the internal splines and the rear seal journal of the yoke assembly with clean transmission fluid.
  2. Install the yoke assembly (1) onto the transmission output shaft.

    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 bolt (3) and seal-ring washer (2).

    4. Tighten
    Tighten the bolt to 123 N·m (91 lb ft).

  4. Attach the vehicle driveline to the transmission yoke assembly. Refer to Transmission Replacement .
  5. Be sure the selector is in the Park (P) position.
  6. Remove the wheel chocks before continuing operation of the vehicle.