GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 GMC C Sierra - 2WD 🢒 Transmission/Transaxle 🢒 Automatic Transmission - Allison 🢒 Manual Shift Shaft and Manual Shift Detent Lever Replacement

Removal Procedure

    Object Number: 658999 Size: SH
  1. Remove the control valve assembly from the transmission. Refer to Control Valve Body Replacement .
  2. Remove the Park/Neutral Position (PNP) switch. Refer to Park/Neutral Position Switch Replacement .
  3. Loosen the nut (1) on the manual shift shaft (5) that retains the detent lever (4) to the manual shift shaft.

    4. Important: DO NOT mar the transmission case surface around the spring pin when removing the spring pin. An unmarred surface is required to maintain the seal between the control valve assembly and the transmission case.

  4. Place a protective plate on the transmission case surface around the spring pin (3). Place a drill bit inside spring pin (3) to prevent cutting or collapsing the pin when removing the pin. Remove the spring pin (3) from the transmission case.
  5. Slide the manual shift shaft (5) through the detent lever (4) and through the manual shift shaft seal.
  6. Rotate the detent lever to disengage the park pawl apply assembly (2). Remove the detent lever (4) and nut (1).

Installation Procedure

    Object Number: 658999 Size: SH
  1. Place the new detent lever (4) in position in the transmission case. Rotate the detent lever to engage the park pawl apply assembly (2). Reinstall the manual shift shaft (5) through the manual shift shaft seal and through the detent lever (4).

    2. 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.

  2. Place the nut (1) in position over the manual shift shaft. Push the manual shift shaft (5) into the final position in the transmission case.
  3. Install the spring pin (3) into the transmission case that retains the manual shift shaft.

    4. Specification
    Spring pin installed height is 8.5-9.0 mm (0.33-0.35 inch) above transmission case surface.

  4. Hand tighten the nut (1).

    5. Tighten
    Tighten the nut (1) to 29 N·m (21 lb ft).

  5. Install the PNP switch. Refer to Park/Neutral Position Switch Replacement .
  6. Install the control valve assembly. Refer to Control Valve Body Replacement .