Operation CHARM: Car repair manuals for everyone.
Home >> GMC Truck >> 2007 >> Sierra 1500 2WD V8-5.3L >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Service and Repair >> Removal and Replacement >> 6L50/6L80/6L90 - Automatic Transmission >> Transmission Replacement

Transmission Replacement



Transmission Replacement

Tools Required

J 21366 Converter Holding Strap

Removal Procedure

1. Disconnect the negative battery cable.
2. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
3. Remove the rear propeller shaft.
4. Support the transmission with a transmission jack.
5. Remove the transmission crossmember.
6. Remove the transmission mount.
7. Remove the catalytic converter pipe.
8. If the vehicle is equipped with a transfer case, remove the front propeller shaft.




9. Remove the torque converter access plug.




10. Remove the left flywheel inspection cover.
11. Remove the starter motor.




12. Remove the right flywheel inspection cover.




13. Remove the flywheel to torque converter bolts.
14. Lower the transmission to gain access to the top and sides of the transmission.




15. Disconnect the vent tube hose and the electrical connections from the transfer case, if equipped.
16. Remove the transfer case, if equipped. Refer to the appropriate procedure:

* Transfer Case Assembly Replacement for the MP 1222/1225/1226-NQG transfer case.
* Transfer Case Assembly Replacement for the MP 1625/1626-NQF transfer case.
* Transfer Case Assembly Replacement for the MP 3023/3024-NQH transfer case.




17. Remove the 2 bolts securing the heat shield to the transmission.
18. Remove the transmission heat shield.




19. Remove the range selector cable retaining clip (1) from the transmission range selector cable.
20. Remove the range selector cable (2) from the range selector lever ball stud and the range selector cable bracket.




21. Disconnect the transmission vent hose.
22. Disconnect the transmission electrical connector from the transmission.
23. Remove the wire harness from the transmission.




24. Remove the bolt that secures the fuel line bracket to the left side of the transmission.




25. Disconnect the transmission oil cooler lines from the transmission.
26. Plug the transmission oil cooler line connectors in the transmission case.




27. Remove the 8 bolts securing the transmission to the engine.
28. Pull the transmission straight back.
29. Install the J 21366 onto the transmission bell housing to retain the torque converter.
30. Remove the transmission from the vehicle while simultaneously removing the fluid level indicator tube.
31. Flush the transmission oil cooler and cooling lines if necessary. Refer to Transmission Fluid Cooler Flushing and Flow Test (J 45096) Transmission Fluid Cooler Flushing and Flow Test (J 35944-A).

Installation Procedure

1. Install the J 21366 onto the transmission bell housing to retain the torque converter.
2. Support the transmission with a transmission jack.
3. Raise the transmission into place while simultaneously installing the fluid indicator tube.
4. Remove the J 21366 from the transmission.
5. 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.

6. Install the 8 bolts securing the transmission to the engine.

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




7. Connect the transmission vent hose.
8. Install the wire harness to the transmission.
9. Connect the transmission electrical connector to the transmission.




10. Install the range selector cable (2) to the range selector cable bracket and the range selector lever ball stud.
11. Install the range selector cable retaining clip (1) to the transmission range selector cable.




12. Install the transmission heat shield.
13. Install the 2 bolts securing the heat shield to the transmission.

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

14. Install the transfer case, if equipped. Refer to the appropriate procedure:

* Transfer Case Assembly Replacement for the MP 1222/1225/1226-NQG transfer case.
* Transfer Case Assembly Replacement for the MP 1625/1626-NQF transfer case.
* Transfer Case Assembly Replacement for the MP 3023/3024-NQH transfer case.




15. Connect the vent hose and electrical connectors to the transfer case, if equipped.




16. If reusing the torque converter bolts, clean the bolt threads and apply LOCTITE 242, GM P/N 12345382 (Canadian P/N 10953489), or equivalent to the threads prior to installation.
17. Install the flywheel to torque converter bolts.

Tighten the bolts to 63 N.m (46 lb ft).




18. Install the right flywheel inspection cover and bolt.

Tighten the bolt to 10 N.m (89 lb in).

19. Install the starter motor.




20. Install the left flywheel inspection cover and bolt.

Tighten the bolt to 10 N.m (89 lb in).




21. Install the torque converter access plug.
22. If the vehicle is equipped with a transfer case, install the front propeller shaft.
23. Install the catalytic converter pipe.
24. Install the transmission mount.
25. Install the transmission crossmember.
26. Remove the transmission jack.
27. Install the rear propeller shaft.




28. Connect the oil cooler lines to the transmission.
29. Lower the vehicle.
30. Connect the negative battery cable.
31. Fill the transmission to the proper level.

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 engine control module (ECM), powertrain control module (PCM), or transmission control module (TCM) will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned.

32. Reset the TAP values. Refer to Transmission Adaptive Functions (TCM).

pro multis · About Operation CHARM