GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 Terraza - 4WD 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T65-E 🢒 Case Extension Replacement

Removal Procedure
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Disconnect the right drive axle from the transaxle. Refer to Front Wheel Drive Shaft Replacement .
  3. Remove the transaxle brace. Refer to Transmission Brace Replacement .
  4. Remove the vehicle speed sensor. Refer to Input Speed Sensor Replacement .

    5. Object Number: 10517 Size: SH
  5. Remove the case extension housing bolts (5).
  6. Remove the case extension housing (6) with the axle seal and the O-ring (8).

    7. Object Number: 10606 Size: SH
  7. Inspect the case extension housing (6) for the following conditions:
    8. • A damaged or porous sealing surface for the case extension seal
    • A damaged or porous sealing surface for the vehicle speed sensor
    • A damaged or porous sealing surface for the right drive axle oil seal
    • A damaged or porous sealing surface for the case extension housing
    • A damaged or worn differential carrier bushing or output shaft bearing
    • Damaged bolt holes
    • Inspect the drive axle seal and replace if necessary.

Installation Procedure
  1. If removed, install the drive axle seal.

    2. Object Number: 10517 Size: SH
  2. Install the case extension housing (6) with the axle seal and with the O-ring (8).

    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 case extension housing bolts (5).

    4. Tighten
    Tighten the bolts (5) to 36 N·m (27 lb ft).

  4. Install the vehicle speed sensor. Refer to Input Speed Sensor Replacement .
  5. Install the transaxle brace. Refer to Transmission Brace Replacement .
  6. Connect the right drive axle to the transaxle. Refer to Front Wheel Drive Shaft Replacement .
  7. Lower the vehicle.

    8. Notice: Do NOT overfill the transaxle. The overfilling of the transaxle causes foaming, loss of fluid, shift complaints, and possible damage to the transaxle.

  8. Adjust the fluid level. Refer to the following information:
    9. •  Transmission Fluid Check
    •  Fluid and Lubricant Recommendations
    •  Approximate Fluid Capacities
  9. Inspect for completion of the repairs.
  10. Inspect for fluid leaks.