Operation CHARM: Car repair manuals for everyone.
Home >> GMC Truck >> 2007 >> Sierra Classic 3500 4WD V8-6.0L >> Repair and Diagnosis >> Transmission and Drivetrain >> Automatic Transmission/Transaxle >> Service and Repair >> Removal and Replacement >> 4L60-E/4L65-E/4L70-E Automatic Transmission >> Transmission Replacement

Transmission Replacement



Transmission Replacement (4.8L, 5.3L, and 6.0L Engines)

Tools Required

^ J 21366 Converter Holding Strap

Removal Procedure

1. Caution:
Refer to Battery Disconnect Caution.

Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection.
2. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
3. Remove the rear propeller shaft. Refer to Two-Piece Propeller Shaft Replacement or One-Piece Propeller Shaft Replacement.
4. Support the transmission with a transmission jack.





5. Remove the nut securing the transmission mount to the transmission support.
6. Remove the nuts and bolts securing the transmission support to the frame.
7. Raise the transmission slightly and remove the transmission support from the vehicle.
8. Remove the exhaust pipe. Refer to Exhaust Manifold Pipe Replacement.
9. Remove the catalytic converter. Refer to Catalytic Converter Replacement.
10. Remove the starter motor. Refer to Starter Motor Replacement.
11. If the vehicle is equipped with a transfer case, remove the front propeller shaft. Refer to Front Propeller Shaft Replacement.
12. Lower the transmission to gain access to the top and sides of the transmission.
13. Disconnect the vent tube hose and the electrical connections from the transfer case, if equipped.
14. Remove the transmission mount.
15. Remove the transfer case, if equipped. Refer to the appropriate procedure:
^ Transfer Case Assembly Replacement for the NVG 261-NP2 transfer case
^ Transfer Case Assembly Replacement for the NVG 149-NP transfer case
^ Transfer Case Assembly Replacement for the NVG 263-NP1 transfer case
16. Remove the shift cable end from the transmission shift lever ball stud and the pan rail bracket. Refer to Automatic Transmission Range Selector Lever Cable Replacement.





17. Remove the transmission heat shield.
18. Disconnect the transmission vent hose, the park/neutral position switch connector, and the main electrical connector from the transmission. Refer to Park/Neutral Position Switch Replacement.





19. Remove the bolt that secures the fuel line bracket to the left side of the transmission.
20. Remove the torque converter access plug.
21. Remove the flywheel to torque converter bolts.
22. Disconnect the transmission oil cooler lines from the transmission. Refer to Transmission Fluid Cooler Hose/Pipe Quick-Connect Fitting Disconnection and Connection.
23. Plug the transmission oil cooler line connectors in the transmission case.





24. Remove the stud and the bolt securing the transmission to the engine.





25. Remove the six studs and one bolt securing the transmission to the engine.
26. Install the J 21366 onto the transmission bell housing to retain the torque converter.
27. Pull the transmission straight back.
28. Remove the transmission from the vehicle while simultaneously removing the fluid level indicator tube.
29. 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.





6. Notice:
Refer to Fastener Notice.

Install six studs and one bolt securing the transmission to the engine.

Tighten the studs and the bolt to 50 Nm (37 ft. lbs.).





7. Install the stud and bolt securing the transmission to the engine.

Tighten the stud and the bolt to 50 Nm (37 ft. lbs.).





8. 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.
9. Install the flywheel to torque converter bolts.

Tighten the bolts to 63 Nm (46 ft. lbs.).

10. Install the torque converter access plug.





11. Install the transmission vent hose, fuel lines, and the wiring harness to the transmission.





12. Install the two bolts securing the heat shield to the transmission.

Tighten the bolt to 17 Nm (13 ft. lbs.).

13. Install the shift cable to the shift lever ball stud and the bracket. Refer to Automatic Transmission Range Selector Lever Cable Replacement
14. Install the transfer case, if equipped. Refer to the appropriate procedure:
^ Transfer Case Assembly Replacement for the NVG 261-NP2 transfer case
^ Transfer Case Assembly Replacement for the NVG 149-NP transfer case
^ Transfer Case Assembly Replacement for the NVG 263-NP1 transfer case





15. Install the two bolts and nut securing the transmission rear mount to the transmission.

Tighten the bolts and nut to 25 Nm (18 ft. lbs.).

16. Connect the vent hose and electrical connectors to the transfer case, if equipped.
17. If the vehicle is equipped with a transfer case, install the front propeller shaft. Refer to Front Propeller Shaft Replacement.
18. Install the starter motor. Refer to Starter Motor Replacement.
19. Install the catalytic converter. Refer to Catalytic Converter Replacement.
20. Install the exhaust pipe assembly. Refer to Exhaust Manifold Pipe Replacement.
21. Install the transmission support to the vehicle.

Tighten the bolts to 70 Nm (50 ft. lbs.).

22. Install the transmission mount to transmission support nut.

Tighten the nuts to 40 Nm (29 ft. lbs.).

23. Remove the transmission jack.
24. Install the rear propeller shaft. Refer to Two-Piece Propeller Shaft Replacement or One-Piece Propeller Shaft Replacement.
25. Connect the oil cooler lines to the transmission. Refer to Transmission Fluid Cooler Hose/Pipe Replacement.
26. Lower the vehicle.

27. Caution:
Refer to Battery Disconnect Caution.

Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection (Auxiliary Battery) Battery Negative Cable Disconnection and Connection (Single Battery).
28. Fill the transmission to the proper level. Refer to Transmission Fluid Check.

29. 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.

Reset the TAP values. Refer to Transmission Adaptive Functions.

pro multis · About Operation CHARM