GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Oldsmobile 🢒 2004 🢒 Alero 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T40-E/4T45-E 🢒 Low/Reverse Servo Assembly Replacement

Removal Procedure

    Caution: Refer to Vehicle Lifting Caution in the Preface section.

  1. Raise the vehicle. Support the vehicle.
  2. Remove the oil pan and filter. Refer to Automatic Transmission Fluid Filter and Seal Replacement .
  3. Remove the oil feed pipes. Refer to Oil Feed Pipes Replacement .

    4. Object Number: 588858 Size: SH
  4. Remove the three low/reverse band servo cover bolts, the servo and the spring.
  5. Disassemble, clean and inspect the low/reverse servo assembly. Refer to Low and Reverse Servo Disassemble .

Installation Procedure
  1. Assemble the low/reverse servo. Refer to Low and Reverse Servo Assemble and Installation .

    2. Object Number: 588858 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.

  2. Install the low/reverse band servo cover bolts.

    3. Tighten
    Tighten the bolts to 12 N·m (106 lb in).

  3. Install the oil feed pipe. Refer to Oil Feed Pipes Replacement .
  4. Install the oil filter and pan. Refer to Automatic Transmission Fluid Filter and Seal Replacement .
  5. Lower the vehicle.
  6. Connect the negative battery cable.
  7. Fill the transmission. Refer to Fluid Capacity Specifications .
  8. Inspect the transmission fluid level. Refer to Transmission Fluid Check .

    9. Important: It is recommended that transmission adaptive pressure (TAP) information be reset.

    Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned.

  9. Reset the TAP values. Refer to Transmission Adaptive Functions .