Extension Housing Gasket

4R70E/4R75E

Extension Housing Gasket













Removal

1. WARNING: Before servicing a vehicle equipped with a fire suppression system, depower the system by following the procedure in Fire Suppression System. Failure to follow the instructions may result in serious personal injury Procedures.
With the vehicle in NEUTRAL, position it on a hoist.

2. NOTE: The output shaft and driveshaft are a balanced assembly.

Mark the driveshaft flange and the rear pinion flange for correct alignment during assembly.





3. Remove the 4 driveshaft bolts.





4. Slide the drive shaft back enough to index-mark the driveshaft, output shaft and the extension housing. Separate the driveshaft from the transmission.





5. Remove the transmission insulator nuts.





6. Disconnect the RH Heated Oxygen Sensor (HO2S) sensor connector.





7. Disconnect the RH catalyst monitor connector.





8. Remove the nuts from the RH exhaust flange.





9. Remove the RH catalytic converter-to-exhaust flange bolts.





10. Disconnect the LH HO2S connector.





11. Disconnect the LH catalyst monitor connector.





12. Remove the nuts from the LH exhaust flange.





13. Remove the LH catalytic converter-to-exhaust flange bolts.





14. Install a suitable transmission jack.

15. Remove the RH side transmission support crossmember bolts.





16. Disconnect the LH side transmission support crossmember.

1. Loosen but do not remove the LH side transmission support crossmember bolts.

2. Remove the LH side transmission support crossmember bolt.





17. Remove the bolts and remove the park brake cable bracket and position aside.





18. 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 crossmember. Only the RH side of the transmission support crossmember will need to be lowered in order to gain access to the rear extension housing.

Lower the RH side of the transmission support crossmember.





19. Remove the transmission insulator bolts.





20. Remove the LH and RH catalyst monitor connector retainers.





21. Remove the extension housing bolts and the extension housing.





22. Remove the extension housing gasket.





Installation

1. Install a new extension housing gasket.





2. Install the extension housing and the bolts.
- Tighten to 55 Nm (41 lb-ft).





3. Install the LH and RH catalyst monitor connector retainers.





4. Install the transmission insulator and insulator bolts.
- Tighten to 90 Nm (66 lb-ft).





5. Position the RH transmission support crossmember and install the bolts.
- Tighten to 70 Nm (52 lb-ft).





6. Install the LH side transmission support crossmember bolt.
- Tighten to 70 Nm (52 lb-ft).





7. Install the park brake cable bracket.
- Tighten to 55 Nm (41 lb-ft).





8. Lower the transmission onto the transmission support crossmember and install the transmission insulator nuts.
- Tighten to 30 Nm (22 lb-ft).





9. Remove the transmission jack.

10. Install a new gasket and position the RH catalytic converter assembly in place and loosely install the bolts. Do not tighten the bolts at this time.





11. Install the RH exhaust flange nuts.
- Tighten to 48 Nm (35 lb-ft).





12. Tighten the RH catalytic converter-to-exhaust flange bolts.
- Tighten to 40 Nm (30 lb-ft).





13. Connect the RH HO2S connector.





14. Connect the RH catalyst monitor connector.





15. Install a new gasket and position the LH catalytic converter assembly in place and loosely install the bolts. Do not tighten the bolts at this time.





16. Install the LH exhaust flange nuts.
- Tighten to 48 Nm (35 lb-ft).





17. Tighten the LH catalytic converter-to-exhaust flange bolts.
- Tighten to 40 Nm (30 lb-ft).





18. Connect the LH HO2S sensor connector.





19. Connect the LH catalyst monitor connector.





20. NOTE: The output shaft and the driveshaft are a balanced assembly.

Install the driveshaft.

- Align the index marks and position the driveshaft on the transmission.

- Install the driveshaft.





21. NOTE: To maintain driveshaft balance, install the driveshaft yoke and flange in the original position that was marked during removal.

Install the 4 retaining bolts.

- Tighten to 103 Nm (76 lb-ft).





22. Lower the vehicle.

23. WARNING: If the vehicle is equipped with a fire suppression system, repower the system. For important safety warnings and procedures, refer to Fire Suppression System. Failure to follow these instructions may result in serious personal injury Procedures.
Check the level of the transmission fluid. Add automatic transmission fluid as necessary.