Tools Required

J 21366 Converter Holding Strap

1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
2. Remove the rear propeller shaft. Refer to Rear Propeller Shaft Replacement in Propeller Shaft.
3. Support the transmission with a suitable jack.
4. Remove the transmission mount nuts.



5. Remove the transmission support bolts/nuts.
6. Remove the transmission support.
7. Raise the transmission slightly and remove the transmission support from the vehicle.
8. Remove the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement in Engine Exhaust.
9. Remove 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




10. Remove the transmission mount bolts and mount.



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



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



15. Disconnect the following electrical connectors:

•	Input speed sensor (1)

•	Output speed sensor (3)

•	Park/neutral position (PNP) switch (5)

•	Transmission (4)

16. Disconnect the oxygen sensor (HO2S) electrical connector.
17. Disconnect the wire harness clip (2) from the bracket on the left side of the transmission.
18. Cut the tie strap to separate the vent hose from the wiring harness.



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



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



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



24. Disconnect the transmission oil cooler lines. Refer to Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection .
25. Plug the transmission oil cooler line fittings.



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



27. Remove the remaining transmission studs.
28. Install the J 21366 onto the transmission bell housing to retain the torque converter.
29. Pull the transmission straight back.
30. Remove the transmission from the vehicle.
31. Flush the transmission oil cooler and lines at this time. Refer to Transmission Fluid Cooler Flushing and Flow Test .

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 the Preface section.

4. Install the transmission studs.

Tighten
Tighten the studs to 50 N·m (37 lb ft).




5. Install the stud on the left side of the transmission.

Tighten
Tighten the stud to 50 N·m (37 lb ft).




6. Remove the plugs from the transmission oil cooler line fittings.
7. Connect the transmission oil cooler lines. Refer to Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection .



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

Tighten
Tighten the bolts to 12 N·m (106 lb in).




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

Tighten
Tighten the bolts to 12 N·m (106 lb in).




10. Align the torque converter to the flywheel.
11. If reusing the torque converter bolts with a 6.0L engine, clean the bolt threads and apply LOCTITE 242 GM P/N 12345382 (Canadian P/N 10953489), or equivalent to the threads prior to installation.
12. If reusing the torque converter bolts with a 8.1L engine, clean the bolt threads and apply LOCTITE 272 GM P/N 12345493 (Canadian P/N 10953488), or equivalent to the threads prior to installation.
13. Install the torque converter bolts.

Tighten
Tighten the bolts to 60 N·m (44 lb ft).

14. Install the flywheel inspection cover.

Tighten
Tighten the bolts to 33 N·m (24 lb ft).




15. Connect the following electrical connectors:

•	Input speed sensor (1)

•	Output speed sensor (3)

•	PNP switch (5)

•	Transmission (4)

16. Connect the HO2S electrical connector.
17. Connect the wire harness clip (2) to the bracket on the left side of the transmission.



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



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



22. Install the transmission mount and bolts.

Tighten
Tighten the bolts to 25 N·m (18 lb ft).

23. 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

24. Install the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement in Engine Exhaust.



25. Install the transmission support.
26. Install the transmission support bolts/nuts.

Tighten
Tighten the bolts to 95 N·m (75 lb ft).




27. Install the transmission mount nuts.

Tighten
Tighten the nut to 50 N·m (37 lb ft).

28. Remove the support from the transmission.
29. Install the rear propeller shaft. Refer to Rear Propeller Shaft Replacement in Propeller Shaft.
30. Fill the transmission fluid. Refer to Automatic Transmission Fluid and Filter Replacement .
31. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
32. Fill the transmission to the proper level with DEXRON® VI transmission fluid. Refer to Transmission Fluid Check .

Important: It is recommended that transmission adaptive pressure (TAP) information be reset.

Resetting the TAP values using a scan tool will erase all learned values in all cells. As a result, The ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned.
33. Reset the TAP values. Refer to Transmission Adaptive Functions .