Notice: Do not overfill the transmission. Overfilling will result in foaming, loss of fluid, and possible damage to the transmission.

1. Inspect the washers on the bolts if the following procedures must be done:

1.1.	The case side cover removal

1.2.	The oil pan removal

2. Install a new washer if the original washer is inverted.
3. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
4. Place the drain pan under the transmission oil pan.
5. Remove the oil pan bolts from the following areas:

•

The front

•

The sides

6. Loosen the rear oil pan bolts.
7. Allow the fluid to drain.



8. Remove the remaining oil pan bolts.

Notice: When removing the oil pan bolts, be careful not to damage the oil pan sealing surfaces. Such damage may result in oil leaks in this area.

9. Tap the oil pan with a rubber mallet or pry the oil pan loose with a screwdriver.
10. Remove the pan.
11. Remove the gasket.
12. Remove the oil filter.



13. Remove the following components for the Hydra-Matic 4T60-E.

13.1.

The screen/filter

13.2.

The lip ring seal pressed in the case, only if replacement is necessary.




14. Inspect the oil pan and the screen for the following foreign materials:

14.1.

Metal particles

14.2.

Clutch facing material

14.3.

Rubber particles

14.4.

Engine coolant

15. Determine the source of the contamination.
16. Correct the source of the contamination.
17. Inspect the pan flange for distortion.
18. Straighten the pan flange, if necessary.

Notice: If the case and oil pan flanges are not dry and free of any oil film, leakage may result.

19. Clean the following components with a solvent:

19.1.

The case

19.2.

The oil pan gasket surfaces

19.1.

Metal particles

19.2.

Clutch facing material

19.3.

Rubber particles

19.4.

Engine coolant

20. Air dry the components.
21. Inspect that all old gasket material is gone.
22. Clean the screen with a solvent.
23. Clean the oil pan with a solvent.
24. Blow-dry both components.

1. Install the new lip ring seal into the case for the Hydra-Matic 4T60-E, if the seal is removed.



2. Install the new filter.



3. Use a new gasket and GM Thread Locker P/N 12345382 in order to install the oil pan.

Tighten
Tighten the bolts to 17 N·m (13 lb ft).

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.

4. Lower the vehicle.
5. Fill the transaxle with the proper quantity of DEXRON III.
6. Place the gear selector in Park.
7. Start the engine.
8. Run the engine at slow idle.
9. Inspect the fluid level.
10. Correct the level as necessary.
11. Inspect the oil pan for leaks.