4L80-E/4L85-E Automatic Transmission

Automatic Transmission Fluid/Filter Replacement
Removal Procedure





1. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
2. Place a drain pan under the transmission oil pan.
3. Remove the oil pan drain plug, if equipped.
4. Allow the transmission fluid to drain completely.
5. Apply a small amount of sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent to the treads of the drain plug, if equipped.

Notice: Refer to Fastener Notice in Service Precautions.

6. Install the oil pan drain plug.
^ Tighten the oil pan drain plug to 18 Nm (13 lb ft).
7. Remove the drain pan from under the transmission oil pan.
8. Support the transmission with a transmission jack.
9. Remove the transmission mount nuts.





10. Remove the transmission support bolts and nuts.
11. Remove the transmission support side bracket bolts and bracket.
12. Remove the transmission support.





13. Disconnect the range selector cable end (2) from the transmission range selector lever ball stud (1).





Important: It is not necessary to remove the selector cable from the bracket.

14. Remove the transmission range selector cable bracket (2) bolts and bracket from the transmission. Reposition the bracket with cable.





15. Remove the oil pan bolts.

Important: The transmission oil pan gasket is reusable. Inspect the gasket and replace as needed.

16. Remove the oil pan and gasket.

17. Remove the magnet from the bottom of the pan, if necessary.





18. Remove the oil filter.
19. Remove the filter neck seal.
20. 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, if necessary.
5. Install the oil pan and bolts.
^ Tighten the oil pan bolts to 24 Nm (18 lb ft).





6. Position the bracket with cable. Install the transmission range selector cable bracket (2) and bolts to the transmission.
^ Tighten the selector bracket bolts to 25 Nm (18 lb ft).





7. Connect the range selector cable end (2) to the transmission range selector lever ball stud (1).





8. Install the transmission support.
9. Install the transmission support side bracket and bolts.
10. Install the transmission support bolts and nuts.
^ Tighten the bolts/nuts to 95 Nm (70 lb ft).





11. Install the transmission mount nuts.
^ Tighten the nuts to 40 Nm (30 lb ft).
12. Remove the transmission jack.
13. Lower the vehicle.
14. Fill the transmission to the proper level with DEXRON(R) III transmission fluid.