Removal

4R70E/4R75E

Transmission

NOTICE: Whenever a transmission has been disassembled to install new parts, the transmission fluid cooler tubes must be cleaned and backflushed using a suitable torque converter/fluid cooler cleaner. A new Oil-To-Air (OTA) cooler must also be installed.

When internal wear or damage has occurred in the transmission, metal particles, clutch plate material or band material may have been carried into the torque converter and transmission fluid cooler. These contaminants are a major cause of recurring transmission concerns and must be removed from the system before the transmission is returned to service.

NOTICE: After the transmission is removed for a major overhaul, it is important to completely clean all transmission components, including torque converter, cooler inlet tube, main control valve body, clutches and all coasting booster valve shuttle balls after any transmission service that generates contamination. These contaminants are a major cause for recurring transmission concerns and must be removed from the system before the transmission is returned to service.

The cleaning of foreign material from the direct clutch check ball is often omitted. This omission can lead to a repeat servicing of the transmission.

A new Oil-To-Air (OTA) transmission fluid cooler must be installed under the following condition.
- Evidence of broken transmission components or transmission fluid contamination found due to the following transmission or converter failure modes:
- Major metallic failure
- Multiple clutches or clutch plate failure
- Sufficient component wear which results in metallic contamination



1. Disconnect the battery ground cable.

2. With the vehicle in NEUTRAL, position it on a hoist.

3. NOTE: Do not drain the transmission unless disassembly or installation of a new transmission is required.

Drain the transmission fluid.

- Loosen the transmission fluid pan bolts and allow the transmission fluid to drain. After transmission fluid has drained, remove the bolts and the pan and drain the remaining transmission fluid that is in the pan.

4. Install the transmission fluid pan and the old gasket.

1. Position the transmission fluid pan gasket.

2. Position the transmission fluid pan.





5. NOTE: The output shaft and driveshaft are a balanced assembly. Mark the driveshaft flange and the rear pinion flange prior to removal for correct alignment during assembly.

Remove the 4 driveshaft bolts.





6. Index-mark the driveshaft and extension housing. Slide the driveshaft back enough to index-mark the driveshaft output shaft and the extension housing. Separate the driveshaft from the transmission.





7. Remove the torque converter access cover plug at the left rear engine block.





8. Remove the torque converter access cover.

1. Remove the 2 bolts.

2. Remove the inspection cover.

3. Remove the bolt for the separator plate.





9. NOTE: Make an identifying mark on the torque converter stud and the flexplate for correct alignment during assembly.

Remove and discard the 4 torque converter-to-flexplate nuts.





10. Disconnect the RH heated Heated Oxygen Sensor (HO2S) connector.





11. Disconnect the RH catalyst monitor connector.





12. Remove the bolts from the RH exhaust flange.





13. Remove the bolts and the RH catalytic converter.





14. Disconnect the LH HO2S connector.





15. Disconnect the LH catalyst monitor connector.





16. Remove the bolts from the LH exhaust flange.





17. Remove the bolts and the LH catalytic converter.





18. Disconnect the selector lever cable from the manual control lever.





19. Remove the selector lever cable bracket and position aside.





20. Remove the ground wire.





21. Remove the starter electrical connector cap.





22. Disconnect the electrical connectors.





23. Remove the 3 starter bolts and the starter.





24. NOTE: The case connectors must be held in place to prevent them from moving.

Disconnect the transmission fluid cooler tubes.





25. Remove the transmission fluid cooler tube bracket and position aside.





26. Position a suitable jack under the transmission. Secure the transmission to the jack with safety straps.

27. Remove the transmission insulator nuts.





28. Remove the RH side transmission support crossmember bolts.





29. Remove the LH side transmission support crossmember bolts.





30. Remove the bolts and remove the parking cable bracket and position aside.





31. NOTICE: The transmission support crossmember is a press-fit in the transmission support crossmember pocket. It may be necessary to pry the transmission support crossmember out of the transmission support crossmember pocket. Be careful not to damage the transmission support crossmember.

Lower the RH side of the transmission support crossmember.





32. NOTICE: The transmission support crossmember is a press-fit in the transmission support crossmember pocket. It may be necessary to pry the transmission support crossmember out of the transmission support crossmember pocket. Be careful not to damage the transmission support crossmember.

Lower the LH side of the transmission support crossmember and remove the transmission support crossmember.





33. Remove the transmission insulator bolts and the transmission insulator.





34. NOTE: It is not necessary to disconnect the transmission harness from all the transmission sensors at this time, the harness will come out with the transmission.

Disconnect the wire harness connectors and remove them from the filler tube.





35. Remove the transmission fluid filler bolt.





36. Position the transmission fluid filler tube aside.





37. Remove the 6 transmission retaining bolts.





38. Separate and lower the transmission from the engine. Partially lower the transmission from under the vehicle.

39. Disconnect the electrical connectors.

1. Remove the catalyst monitor connector retainer from the stud.

2. Disconnect the transmission vehicle harness connector.





40. Disconnect the electrical connectors and remove the wire harness from the transmission.

1. Disconnect the TR sensor connector.

2. Disconnect the Output Shaft Speed (OSS) sensor connector.

3. Disconnect the Turbine Shaft Speed (TSS) sensor connector.

- Remove the catalyst monitor connector retainer from the stud.

- Disconnect the wire harness retainers and remove the harness.





41. Lower the transmission from under the vehicle.

42. Carry out the transmission fluid cooler backflushing and cleaning if the transmission is being overhauled or installing a new or remanufactured transmission. For additional information, refer to Transmission Fluid Cooler Tubes Backflushing and Cleaning Transmission Fluid Cooler Tubes Backflushing and Cleaning.