Vibration/Noise From Auto/Manual Shifter During Drive/Gear Shifts (Replace Front Prop Shaft To Transmission Flange Retaining Bolts)

Some customers with automatic/manual transmissions may comment on a vibration/noise from the shifter when driving or during gear shifts.

This condition may be due to torque reversals and driveline vibrations causing the threads on the front propeller shaft to transmission flange retaining bolt to wear down. As the bolt shaft diameter decreases, the clearance may increase between the bolt and the transmission output shaft flange creating a vibration or noise.

Important: It is important to follow the new procedures in this bulletin because the automatic and manual transmission fastener attachments are different.

Important: The Propeller Shaft Replacement procedure has been updated within SI.

A newly designed shouldered retaining bolt and new installation procedure is now available. Install three new bolts, washers and nuts. Refer to the appropriate procedure in this bulletin.

1. Place the shifter lever in Neutral.
2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in the General Information sub-section of the Service Manual, SI Document #813128.
3. Remove the exhaust system. Refer to Exhaust System Replacement in the Engine Exhaust sub-section of the Service Manual, SI Document #783469.

Important: DO NOT REMOVE all three propeller shaft to transmission flange bolts at the same time. DO NOT REMOVE the coupler from the propeller shaft.

4. Remove one front prop shaft to transmission flange bolt.



5. Install a new bolt (6), P/N 11588658, with the bolt head to the forward side of the AUTOMATIC transmission output shaft flange (1).
6. Install a new washer (5), P/N 11588689, and new nut (4), P/N 11516073, to the rearward side of the front propeller shaft coupler (2).
7. Repeat Steps 4 -- 6 for the two remaining bolts.
8. Tighten the new nuts.

Tighten
Tighten the nuts on the propeller shaft to AUTOMATIC transmission flange bolts to 85 N·m (63 lb ft).

9. Verify that the nuts on the propeller shaft coupler to differential flange bolts are tightened to 85 N·m (63 lb ft).

•	If the nuts are loose, replace the bolts, washers and nuts. Go to Step 10.

•	If the torque on the nuts is to specification, go to Step 15.





Important: DO NOT REMOVE all three propeller shaft to differential flange bolts at the same time. DO NOT REMOVE the coupler from the propeller shaft.

10. Remove one rear prop shaft to differential flange bolt.
11. Install a new bolt (6), P/N 11588658, and washer (5), P/N 11588689, with the washer and bolt head to the forward side of the rear propeller shaft coupler (2).
12. Install a new nut (4), P/N 11516073, to the rearward side of the DIFFERENTIAL output shaft flange (3).
13. Repeat Steps 10 -- 12 for the two remaining bolts.
14. Tighten the new nuts.

Tighten
Tighten the nuts on the propeller shaft to DIFFERENTIAL flange bolts to 85 N·m (63 lb ft).

15. Install the exhaust system. Refer to Exhaust System Replacement in the Engine Exhaust sub-section of the Service Manual, SI Document #783469.
16. Lower the vehicle.
17. Place the shifter lever in Park.

1. Place the shifter lever in Neutral.
2. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in the General Information sub-section of the Service Manual, SI Document #813128.
3. Remove the exhaust system. Refer to Exhaust System Replacement in the Engine Exhaust sub-section of the Service Manual, SI Document #783469.

Important: DO NOT REMOVE all three prop shaft to transmission flange bolts at the same time. DO NOT REMOVE the coupler from the propeller shaft.

4. Remove one front prop shaft to transmission flange bolt.



5. Install a new bolt (5), P/N 11588658, and washer (4), P/N 11588689, with the washer and bolt head to the rearward side of the front propeller shaft coupler (3).
6. Install a new nut (1), P/N 11516073, to the forward side of the MANUAL transmission output shaft flange (2).
7. Repeat Steps 4 -- 6 for the two remaining bolts.
8. Tighten the new nuts.

Tighten
Tighten the nuts on the propeller shaft to MANUAL transmission flange bolts to 85 N·m (63 lb ft).

9. Verify that the nuts on the propeller shaft coupler to differential flange bolts are tightened to 85 N·m (63 lb ft).

•	If the nuts are loose, replace the bolts, washers and nuts. Go to Step 10.

•	If the torque on the nuts is to specification, go to Step 15.





Important: DO NOT REMOVE all three propeller shaft to differential flange bolts at the same time. DO NOT REMOVE the coupler from the propeller shaft.

10. Remove one rear prop shaft to differential flange bolt.
11. Install a new bolt (6), P/N 11588658, and washer (5), P/N 11588689, with the washer and bolt head to the forward side of the rear propeller shaft coupler (2).
12. Install a new nut (4), P/N 11516073, to the rearward side of the DIFFERENTIAL output shaft flange (3).
13. Repeat Steps 10 -- 12 for the two remaining bolts.
14. Tighten the new nuts.

Tighten
Tighten the nuts on the propeller shaft to DIFFERENTIAL flange bolts to 85 N·m (63 lb ft).

15. Install the exhaust system. Refer to Exhaust System Replacement in the Engine Exhaust sub-section of the Service Manual, SI Document #783469.
16. Lower the vehicle.
17. Place the shifter lever in Park.

For vehicles repaired under warranty, use: