Transmission Replacement
Transmission Replacement (LP1, LY7)
Removal Procedure
Important: NEW torque converter bolts will be required each time the torque converter bolts are removed.
1. Disconnect the negative battery cable. Remove the thermostat housing to gain access to the upper transmission mounting bolts.
3. Raise and support the vehicle. Vehicle Lifting.
4. Remove the transmission manual shift shaft nut.
5. Disconnect the shift linkage from the transmission.
6. Place the transmission in NEUTRAL by rotating the transmission shift shaft clockwise 2 clicks.
7. Remove the exhaust system.
8. Disconnect the propeller shaft coupler (1) from the transmission flange.
9. Push the front propeller shaft toward the rear of the vehicle in order to release the propeller shaft coupler (1) from the transmission flange.
10. Secure the front propeller shaft (1) to the shift control lever (3) with a piece of mechanics wire (2).
11. Disconnect the transmission wiring harness connector (1) from the transmission by rotating the locking latch (2) counterclockwise.
12. Disconnect the wiring harness clips from the transmission, and position the wiring harness aside.
13. Remove the starter motor to gain access to the torque converter bolts.
14. Mark the torque converter to flexplate/flywheel orientation to ensure proper realignment.
15. Remove the front air deflector.
16. Repeat the following steps for all 3 torque converter bolts:
1. Rotate the harmonic balancer center bolt clockwise ONLY, in order to align the torque converter bolt with the starter motor opening in the engine block.
2. Remove and discard the torque converter bolt. The bolt is self locking and is NOT reusable.
17. Place an oil drain pan under the transmission fluid cooler pipes.
18. Remove the bolt securing the transmission fluid cooler pipes brace to the engine.
19. Disconnect the fluid cooler pipes from the transmission.
20. Plug the open outlet ports to prevent fluid loss and contamination.
21. Position a suitable transmission jack under the transmission.
22. Remove the transmission mount.
23. Remove the engine close out cover studs and cover.
24. Remove the left side transmission bolts.
25. Support the engine with a suitable jack. Loosen the two rear cradle bolts approximately one inch. Lower the engine and transmission just enough to gain access to the remaining transmission bolts.
26. Remove the 2 battery cable/wiring harness retainers from the upper bellhousing area of the transmission.
27. Remove the engine close out cover studs and cover.
28. Remove the right side transmission bolts.
29. Pull the transmission free from the engine dowels.
Important: Ensure clearance is maintained between the transmission and the following:
* The catalytic converters
* The wiring harnesses
* The cooler pipes
* The propeller shaft
Carefully lower the transmission from the vehicle.
30. Flush the transmission oil cooler. Refer to Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096). Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096)
31. If the transmission is being replaced, remove the drive flange and install it on the replacement unit. Refer to Drive Flange and Seal Replacement.
Installation Procedure
Important: Ensure clearance is maintained between the transmission and the following:
* The catalytic converters
* The wiring harnesses
* The cooler pipes
* The propeller shaft
Using the transmission jack, carefully raise the transmission to the vehicle.
1. Align the transmission with the engine dowels.
Notice: Refer to Fastener Notice.
2. Install the right side transmission bolts.
Tighten the bolts to 50 N.m (37 lb ft).
3. Lower the engine and transmission only enough to gain access to the remaining upper transmission bolts.
4. Install the engine close out cover and studs.
Tighten the studs to 10 N.m (89 lb in).
5. Install the left side transmission bolts.
Tighten the bolts 50 N.m (37 lb ft).
Important: If necessary, install NEW battery cable/wiring harness retainers.
6. Install the 2 battery cable/wiring harness retainers to the upper bellhousing area of the transmission.
7. Raise the engine and tighten the rear cradle bolts.
Tighten the bolts to 191 N.m (141 lb ft).
8. Connect the engine wiring harness retaining clips (1) to the transmission mounting bolts.
9. Install the transmission mount.
10. Remove transmission jack from under the transmission.
Important: Replace the O-rings if cracked, cut, or distorted.
11. Lubricate the O-rings with automatic transmission fluid.
12. Install the O-rings onto the cooler pipes prior to inserting the cooler pipes into the transmission.
13. Insert the transmission fluid cooler pipes into the transmission.
14. Install the bolt securing the transmission fluid cooler pipe retainer to the transmission.
Tighten the bolt to 25 N.m (18 lb ft).
15. Install the bolt securing the transmission fluid cooler pipes brace to the engine.
Tighten the bolt to 50 N.m (37 lb ft).
16. Align the torque converter to flexplate/flywheel orientation marks made during the removal procedure.
Important: Torque converter bolts are self locking and must be replaced with NEW torque converter bolts every time the bolts are removed.
17. Repeat the following steps for all 3 torque converter bolts:
1. Rotate the harmonic balancer center bolt clockwise ONLY, in order to align the torque converter bolt holes in the flexplate/flywheel with the starter motor opening in the engine block.
2. To aid in alignment of the torque converter to the flexplate/flywheel. Install all 3 NEW torque converter bolts before fully tightening.
Tighten the bolts to 63 N.m (46 lb ft).
18. Install the starter motor.
19. Install the front air deflector.
20. Connect the wiring harness clips to the transmission.
21. Connect the transmission wiring harness connector (1) to the transmission by rotating the locking latch (2) clockwise.
22. Remove the mechanics wire (2) securing front propeller shaft (1) to the shift control lever (3).
23. Install the propeller shaft coupler (1) to the transmission flange.
24. Place the transmission in the park position by rotating the shift shaft fully counterclockwise.
25. Connect the shift linkage to the transmission.
26. Install the transmission manual shift shaft nut.
Tighten the nut to 15 N.m (11 lb ft).
27. Install the exhaust system.
28. Check the transmission fluid level (fill if necessary). Refer to Transmission Fluid Checking. Transmission Fluid Check
29. Adjust the shift control linkage. Refer to Shift Control Linkage Adjustment.
30. Lower the vehicle.
31. Install the thermostat housing.
32. Connect the negative battery cable.
33. The transmission control module must be programmed with the proper software/calibrations. Refer to Control Module References for programming and setup information.
Transmission Final Test and Inspection
Complete the following procedure after the transmission is installed in the vehicle:
1. With the ignition OFF or disconnected, crank the engine several times. Listen for any unusual noises or evidence that any parts are binding.
2. Start the engine and listen for abnormal conditions.
3. While the engine continues to idle raise and support the vehicle. Refer to Vehicle Lifting.
4. Inspect for fluid leaks while the engine is idling.
5. Lower the vehicle.
6. Perform a final inspection for the proper fluid 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 ECM, PCM or TCM will need to relearn TAP values. Transmission performance may be affected as new TAP values are learned.
7. Reset the TAP values. Refer to Transmission Adaptive Functions.
8. Road test the vehicle.