GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Caution: When the transmission is at operating temperatures, take necessary precautions when removing the drain plug, to avoid being burned by draining fluid.


    Object Number: 23578  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Place a drain pan under the transmission oil pan.
  3. Remove the oil pan bolts from the front and sides of the pan only.
  4. Loosen the rear oil pan bolts approximately 4 turns.
  5. Lightly tap the oil pan with a rubber mallet in order to loosen the pan to allow the fluid to drain.

  6. Object Number: 13952  Size: SH
  7. Remove the remaining oil pan bolts.

  8. Object Number: 13955  Size: SH
  9. Remove the oil pan and the gasket.

  10. Object Number: 13958  Size: SH
  11. Grasp firmly while pulling down with a twisting motion in order to remove the filter.

  12. Object Number: 71459  Size: SH
  13. Remove the filter seal. The filter seal may be stuck in the pump; if necessary, carefully use pliers or another suitable tool to remove the seal.
  14. Discard the seal.
  15. Inspect the fluid color.
  16. Inspect the filter. Pry the metal crimping away from the top of the filter and pull apart. The filter may contain the following evidence for root cause diagnosis:
  17. • Clutch material
    • Bronze slivers indicating bushing wear
    • Steel particles
  18. Clean the transmission case and the oil pan gasket surfaces with solvent, and air dry. You must remove all traces of the old gasket material.

Installation Procedure


    Object Number: 71460  Size: SH
  1. Coat the new filter seal with automatic transmission fluid.
  2. Install the new filter seal into the transmission case. Tap the seal into place using a suitable size socket.
  3. Install the new filter into the case.

  4. Object Number: 13955  Size: SH
  5. Install the oil pan and a new gasket.

  6. Object Number: 13952  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.

  7. Install the oil pan bolts.
  8. Tighten
    Tighten the oil pan to transmission case bolts alternately and evenly to 12 N·m (106 lb in).

  9. Lower the vehicle.
  10. Fill the transmission to the proper level with DEXRON® III transmission fluid. Refer to Transmission Fluid Check and Fluid Capacity Specifications .
  11. Check the COLD fluid level reading for initial fill only.
  12. Inspect the oil pan gasket for leaks.