4L80-E/4L85-E Automatic Transmission

Automatic Transmission Fluid and Filter Replacement

Removal Procedure

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Place a drain pan under the transmission oil pan.
3. Remove the oil pan drain plug, if equipped.




4. Remove the oil pan bolts.
5. Remove the oil pan.
6. Remove the gasket.
7. Remove the magnet.




8. Remove the oil filter.
9. Remove the filter neck seal.
10. The transmission oil pan gasket is reusable.
Inspect the gasket and replace as needed.
11. Clean the transmission case and the oil pan gasket surfaces with solvent.

Installation Procedure




1. Install the filter neck seal.
2. Install the oil filter.




3. Install the oil pan gasket to the pan.
4. Install the magnet into the bottom of the pan.

Notice: Refer to Fastener Notice .

5. Install the oil pan to the transmission with seventeen bolts.

Tighten the oil pan bolts to 11 N.m (97 lb in).

6. Apply a small amount of sealant GM P/N 12346004 to the treads of the drain plug, if equipped.
7. Install the oil pan drain plug, if equipped.

Tighten the oil pan drain plug to 18 N.m (13 lb ft).

8. Lower the vehicle.
9. Fill the transmission to the proper level with Dexron(R) VI transmission fluid. Refer to Transmission Fluid Check .