Extension Housing Gasket

4R70E/4R75E

Extension Housing Gasket













Removal

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

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

Index-mark the driveshaft flange and the rear pinion flange for correct alignment during assembly.





3. Remove the 4 driveshaft bolts.





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





5. Remove the rear transmission insulator nuts.





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





7. Disconnect the RH catalyst monitor connector.





8. Remove the bolts from the RH exhaust flange.





9. Remove the 2 bolts and the RH catalytic converter.





10. Disconnect the LH HO2S connector.





11. Disconnect the LH catalyst monitor connector.





12. Remove the bolts from the LH exhaust flange.





13. Remove the 2 bolts and the LH catalytic converter.





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 parking 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 transmission support 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 rear transmission insulator bolts.





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





21. Remove the 2 stud bolts and the 4 rear extension housing bolts and the housing.





22. Remove the extension housing gasket.





Installation

1. Install a new extension housing gasket.





2. Install the 4 extension housing bolts along with the 2 stud bolts.
- Tighten to 55 Nm (41 lb-ft).





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





4. Install the rear transmission insulator and 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 parking brake cable bracket.
- Tighten to 55 Nm (41 lb-ft).





8. Lower the transmission onto the transmission support crossmember and install the rear 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 pipe 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 pipe bolts.
- Tighten to 40 Nm (30 lb-ft).





18. Connect the LH HO2S 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 driveshaft bolts.

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





22. Lower the vehicle.

23. Check the level of the transmission fluid. Add transmission fluid as necessary.