GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2000 🢒 Regal 🢒 Transmission/Transaxle 🢒 Automatic Transaxle - 4T65-E 🢒 Oil Pan Replacement

Removal Procedure

    Notice: Do NOT use any type of grease to retain parts during the assembly of this unit. Using greases other than the recommended assembly lube changes the transaxle fluid characteristics. Using greases other than the recommended assembly lube causes undesirable shift conditions and/or filter clogging. Use TRANSJEL™ J 36850 or equivalent during the assembly of this unit.

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Place a drain pan under the transaxle bottom oil pan.

    3. Object Number: 164804 Size: SH
  3. Remove the oil pan bolts (23) from the front.
  4. Remove the oil pan bolts (23) from the sides.
  5. Loosen the rear oil pan bolts (23) approximately four turns.

    6. Notice: Ensure care is taken NOT to damage the mating surfaces of the oil pan and of the case or oil leaks may occur.

  6. Use a rubber mallet in order to lightly tap the oil pan, or use a screwdriver in order to pry the oil pan loose.
  7. Allow the fluid to drain.
  8. Remove the remaining oil pan bolts (23).
  9. Remove the oil pan (24).
  10. Remove the oil pan gasket (25).
  11. Inspect the oil pan and the filter screen for the following foreign material:
    12. • Metal particles
    • Clutch facing material
    • Rubber particles
    • Engine coolant
  12. Determine the source of the contamination if foreign material is evident.
  13. Correct the source of the contamination.

    14. Object Number: 164780 Size: SH
  14. Inspect the oil pan flange (1) for distortion.
  15. Replace a bent or distorted oil pan. Do not attempt to straighten the pan.

    16. Object Number: 164805 Size: SH
  16. When service requires the removal of the bottom oil pan, inspect the washers on the bolts.

    17. Object Number: 164806 Size: SH
  17. If the washer is inverted, install a new bolt and washer assembly.

    18. Notice: Ensure the oil pan and the case flanges are dry and are free of any oil film or leakage may result.

  18. Use solvent in order to clean the case.
  19. Air dry the case.
  20. Use solvent in order to clean the oil pan gasket surfaces.
  21. Air dry the oil pan gasket surfaces.
  22. Remove all traces of the old gasket material.

Installation Procedure

    Object Number: 164804 Size: SH
  1. Install the oil pan gasket (25).
  2. Install the oil pan (24).

    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 oil pan bolts (23).

    4. Tighten
    Tighten the oil pan bolts (23) to 14 N·m (10 lb ft).

  4. Lower the vehicle.
  5. Fill the transaxle with the proper quantity of DEXTRON® III.
  6. Place the gear selector in the Park position.
  7. Start the engine.
  8. Run the engine at a slow idle. Do NOT race the engine.

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

  9. Adjust the fluid level.
  10. Inspect for proper completion of the repairs.
  11. Inspect for fluid leaks.