GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2007 🢒 Lucerne 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T80-E 🢒 Detent Lever and Roller Assembly Replacement

Removal Procedure
  1. Remove the scavenge screens. Refer to Transfer Oil Pump Inlet Screen and Pipe Seal Replacement .
  2. Remove the lower controls and valve assembly. Refer to Lower Control Valve Body Assembly Removal .

    3. Object Number: 687598 Size: SH
  3. Using a pair of pliers, grasp the detent roller end of the detent spring (27). Remove the detent spring (27).
  4. Remove the 13 mm detent roller bolt pivot arm, the sleeve, and the washer (26).
  5. Remove the 15 mm manual shaft nut (18). You must hold the detent lever (17) in place when removing the manual shaft nut (18) in order to prevent damage to the actuator rod (21).
  6. Remove the detent lever (17) and the actuator rod (21).

Installation Procedure
  1. Install the detent lever (17) and the actuator rod (21).
  2. You must hold the detent lever (17) in place when installing the manual shaft nut (18) in order to prevent damage to the actuator rod (21).

    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 15 mm manual shaft nut (18).

    4. Tighten
    Tighten the manual shaft to detent lever nut to 27-34 N·m (20-25 lb ft).

  4. Install the 13 mm detent roller bolt pivot arm, the sleeve, and the washer (26).

    5. Tighten
    Tighten the detent lever and roller assembly bolt to 8-14 N·m (6-10 lb ft).


    Object Number: 687598 Size: SH
  5. Using a pair of pliers, grasp the detent roller end of the detent spring (27). Install the detent spring (27).
  6. Install the lower controls and valve assembly. Refer to Lower Controls Assembly Installation .
  7. Install the scavenge screens. Refer to Transfer Oil Pump Inlet Screen and Pipe Seal Replacement .