4L80-E/4L85-E Automatic Transmission

Transmission Replacement
^ Tools Required
- J 21366 Converter Holding Strap

Removal Procedure





1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Starting and Charging.
2. Drain the transmission fluid.
3. Remove the rear propeller shaft. Refer to Propeller Shaft Replacement - Rear in Propeller Shaft.
4. Support the transmission with a suitable jack.
5. Remove the transmission mount nuts.





6. Remove the transmission support bolts/nuts.
7. Remove the transmission support,
8. Raise the transmission slightly and remove the transmission support from the vehicle.
9. Remove the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement (SOL and 8.1L Engines) in Engine Exhaust.
10. Remove the transfer case, if equipped. Refer to:
^ Transfer Case Assembly Replacement in Transfer Case - NVG 246-NP8
^ Transfer Case Assembly Replacement5 in Transfer Case -BW 4482-NR4





11. Remove the transmission mount bolts and mount.





12. Ensure the transmission manual shaft is positioned in mechanical park.
13. Remove the retainer that secures the cable to the bracket.





14. Remove the range selector cable end (2) from the transmission range selector lever ball stud (1).
15. Depress the tangs and remove the cable from the bracket.





16. Disconnect the following electrical connectors:
^ Input speed sensor (1)
^ Output speed sensor (3)
^ Park/neutral position (PNP) switch (5)
^ Transmission (4)
17. Disconnect the oxygen sensor (HO2S) electrical connector.
18. Disconnect the wire harness clip (2) from the bracket on the left side of the transmission.
19. Cut the tie strap to separate the vent hose from the wiring harness.





20. Remove the flywheel inspection cover.
21. Mark the torque converter to flywheel orientation.
22. Remove the torque converter bolts.





23. If equipped with a 6.0L engine, remove the exhaust hanger mounting bracket bolts and bracket.





24. If equipped with a 6.0L or 8.1 L engine, remove the exhaust hanger mounting bracket bolts and bracket.





25. Disconnect the transmission oil cooler lines.
26. Plug the transmission oil cooler line fittings.





27. Remove the stud on the left side of the transmission.





28. Remove the remaining transmission studs.
29. Install the J 21366 onto the transmission bell housing to retain the torque converter.
30. Pull the transmission straight back.
31. Remove the transmission from the vehicle.
32. Flush the transmission oil cooler and lines at this time. Refer to Automatic Transmission Oil Cooler Flushing and Flow Test (J 35944-A) or Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096).

Installation Procedure





1. Install the transmission to the vehicle.
2. Raise the transmission into place and remove the J 21366 from the transmission.
3. Slide the transmission straight onto the locating pins while lining up the marks on the flywheel and the torque converter. The torque converter must rotate freely by hand.

Notice: Refer to Fastener Notice in Service Precautions.

4. Install the transmission studs.
^ Tighten the studs to 50 Nm (37 ft. lbs.).





5. Install the stud on the left side of the transmission.
^ Tighten the stud to 50 Nm (37 ft. lbs.).





6. Remove the plugs from the transmission oil cooler line fittings.
7. Connect the transmission oil cooler lines.





8. If equipped with a 6.0L or 8.1 L engine, install the exhaust hanger mounting bracket and bolts.
^ Tighten the bolts to 12 Nm (106 inch lbs.).





9. If equipped with a 6.0L engine, install the exhaust hanger mounting bracket and bolts.
^ Tighten the bolts to 12 Nm (106 inch lbs.).





10. Align the torque converter to the flywheel.
11. Install the torque converter bolts.
^ Tighten the bolts to 60 Nm (44 ft. lbs.).
12. Install the flywheel inspection cover.
^ Tighten the bolts to 33 Nm (24 ft. lbs.).





13. Connect the following electrical connectors:
^ Input speed sensor (1)
^ Output speed sensor (3)
^ PNP switch (5)
^ Transmission (4)
14. Connect the HO2S electrical connector.
15. Connect the wire harness clip (2) to the bracket on the left side of the transmission.





16. Depress the tangs and install the cable to the bracket.
17. Install the range selector cable end (2) to the transmission range selector lever ball stud (1).





18. Ensure the transmission manual shaft is positioned in mechanical park.
19. Install the retainer that secures the cable to the bracket.





20. Install the transmission mount and bolts.
^ Tighten the bolts to 25 Nm (18 ft. lbs.).
21. Install the transfer case, if equipped. Refer to:
^ Transfer Case Assembly Replacement in Transfer Case - NVG 246-NP8
^ Transfer Case Assembly Replacement in Transfer Case -BW 4482-NR4
22. Install the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement (GIL and 8.1L Engines) in Engine Exhaust.





23. Install the transmission support.
24. Install the transmission support bolts/nuts.
^ Tighten the bolts to 95 Nm (75 ft. lbs.).





25. Install the transmission mount nuts.
^ Tighten the nut to 50 Nm (37 ft. lbs.).
26. Remove the support from the transmission.
27. Install the rear propeller shaft. Refer to Propeller Shaft Replacement - Rear in Propeller Shaft.
28. Fill the transmission fluid.
29. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Starting and Charging.
30. Fill the transmission to the proper level with DEXRON- III transmission fluid. Refer to Transmission Fluid Checking Procedure.