Drive Pinion Flange/Yoke and/or Oil Seal Replacement RPOLP1/LY7

Special Tools

1. Raise and support vehicle. Refer to Lifting and Jacking the Vehicle.
2. Remove the exhaust system. Refer to Exhaust System Replacement.
3. Remove the propeller shaft. Refer to Rear Propeller Shaft Replacement.



4. Use the J 45012 to hold the pinion flange.
5. Using the J 34826 , remove the drive pinion nut.



6. Using the J 45019 , remove the flange.
7. Using a flat-bladed tool, remove the drive pinion seal. Take care not to damage any sealing surfaces.

Note: Ensure the pinion bore is free of dirt debris.

1. Apply a small amount of synthetic gear oil GM P/N 12378514 (Canadian P/N 88901045) or equivalent to the drive pinion flange sealing surface of the drive pinion seal.



2. Using the J 42851  (1), install the pinion seal (2) to the differential housing (3).



3. Install the J 45012 on the drive pinion shaft.
4. Install the pinion flange on the drive pinion shaft.

Note: The pinion shaft threads and the pinion flange nut must be free of residue and debris prior to the application of the threadlocker.

5. Thoroughly clean the residue from the pinion shaft threads and the pinion flange nut by using denatured alcohol or equivalent and allow to dry.
6. Apply threadlocker GM P/N 12345382 (Canadian P/N 10953489), or equivalent to 2/3 of the threaded length of the pinion shaft threads. Ensure that there are no gaps in the threadlocker along the length of the filled area of the pinion shaft threads.
7. Allow the threadlocker to cure approximately 10 minutes before installation.
8. Use the J 45012 to hold the pinion flange.

Caution: Refer to Fastener Caution in the Preface section.

9. Using the J 34826 , tighten the drive pinion nut to 245 N·m (181 lb ft).
10. Install the propeller shaft. Refer to Rear Propeller Shaft Replacement.
11. Inspect the fluid level. Refer to Rear Axle Lubricant Level Inspection.
12. Install the exhaust system. Refer to Exhaust System Replacement.
13. Lower the vehicle.

Drive Pinion Flange/Yoke and/or Oil Seal Replacement RPO LSA

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Remove the exhaust system. Refer to Exhaust System Replacement .
3. Remove the propeller shaft from the vehicle. Refer to Rear Propeller Shaft Replacement.




Note: Position the bolt (3)  behind and outside of the J 45012.

4. Using the J 45012 holder  (1)  and the J 34826 socket  (2), remove the drive pinion flange nut.
5. Remove the J 45012 holder .



6. Using the J 45019 remover  (1), remove the flange.




Note: Do not damage the sealing surfaces of the pinion shaft or differential pinion housing.

7. Using the appropriate tool, remove the drive pinion seal (2) from the differential housing (1).

1. Remove any debris and excess gear lubricant from the pinion bore.
2. Lubricate the drive pinion flange sealing surface with the gear lubricant. Refer to Adhesives, Fluids, Lubricants, and Sealers.



3. Using the J 42851 installer  (1), install the drive pinion seal to the differential housing.

Note: Allow the drive pinion gear threads and the nut to air dry.

4. Using the appropriate cleaning solvent, thoroughly clean the drive pinion shaft threads and the drive pinion flange nut.

Note: Ensure that there are no gaps in the threadlocker along the length of the filled area of the pinion shaft threads.

5. Apply threadlocker to  2/3 of the threaded length of the pinion shaft threads. Refer to Adhesives, Fluids, Lubricants, and Sealers.



6. Position the drive flange (2) on the pinion gear (1).
7. Install the pinion nut (3) on the pinion gear (1).

Caution: Refer to Fastener Caution in the Preface section.





Note: Position the bolt (3)  behind and outside of the J 45012.

8. Using the J 45012 holder  (1) and the J 34826 socket  (2) , tighten the pinion nut to 245 N·m (181 lb ft).
9. Install the propeller shaft. Refer to Rear Propeller Shaft Replacement
10. Inspect the rear drive axle lubricant level. Refer to Rear Axle Lubricant Level Inspection .
11. Install the exhaust system. Refer to Exhaust System Replacement .
12. Remove the supports and lower the vehicle.