Buick Regal: Differential Carrier Assembly Replacement

Removal Procedure

1. Raise and support the vehicle.

2. Differential Carrier Assembly - Drain.

3. Exhaust Muffler - Remove.

4. Propeller Shaft - Remove.

5. Parking Brake Actuator - Disconnect.

6. Rear Wheel Drive Shaft - Remove.

7. Disconnect the differential carrier electrical connectors at the chassis.

NOTE: Ensure that the differential carrier is securely fastened to the hydraulic jack stand.

8. Support the differential carrier with a jack stand.

9.

Differential Carrier Insulator Bolt(1) - Remove.

10.

Differential Carrier Insulator Bolt(1) - Remove.

11.

Differential Carrier Assembly(1) - Remove.

Installation Procedure

1.

Differential Carrier Assembly(1) - Install.

2.

Clean the bolts and apply thread locker on the threads.

CAUTION: Refer to Fastener Caution.

3. Differential Carrier Insulator Bolt(1) - Install and tighten.

• First Pass: 80 N.m (59 lb ft)
• Final Pass: 60-75 degrees

4.

CAUTION: This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component.

Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component.

Differential Carrier Insulator Bolt(1) - Install and tighten

• First Pass: 100 N.m (74 lb ft)
• Final Pass: 30 to 45 degrees

5. Remove the hydraulic jack.

6. Rear Wheel Drive Shaft - Install.

7. Parking Brake Actuator - Connect.

8. Connect the differential carrier electrical connectors at the chassis.

9. Propeller Shaft - Install.

10. Exhaust Muffler - Install.

11. Check the fluid level. If necessary, fill the differential carrier to the bottom of the fill plug hole with the recommended fluid.

12. If installing a NEW differential carrier, fill with the recommended fluid.

13. Remove the supports and lower the vehicle.

14. Program the differential carrier control module.

LIMITED SLIP DIFFERENTIAL CLUTCH HIGH PRESSURE PIPE REPLACEMENT

CAUTION: It is very important to observe maximum cleanliness when working on the differential clutch. Dirt particles can seriously damage the function and service life of the differential clutch.

Preliminary Procedure

Differential Carrier Assembly - Remove.

1. Limited Slip Differential Clutch High Pressure Pipe

WARNING: The hydraulic pressure in the differential clutch is very high. To prevent personal injury, wait for at least 10 minutes before removing any parts from the differential clutch.

Procedure

Check the fluid level. If necessary, fill the differential to the bottom of the fill plug hole with the recommended fluid.

DIFFERENTIAL DRIVE PINION GEAR SEAL REPLACEMENT

Preliminary Procedures

1. Raise and support the vehicle. Lifting and Jacking the Vehicle.

2. Remove the propeller shaft.

NOTE: Install a NEW differential drive pinion gear oil slinger.

3. Remove the differential drive pinion gear oil slinger.

1. Differential Drive Pinion Gear Seal

Procedure

1. Install a sheet metal screw into the seal.
2. Attach a pair of pliers or a slider hammer to the screw and remove the seal.
3. Inspect the fluid level.

Special Tools

J-24428-A Seal Installer

Equivalent regional tools:Special Tools.

DIFFERENTIAL DRIVE PINION GEAR OIL SLINGER REPLACEMENT

Preliminary Procedures

1. Raise and support the vehicle.

2. Remove the propeller shaft.

1. Differential Drive Pinion Gear Oil Slinger

NOTE: Install a NEW Differential Drive Pinion Gear Oil Slinger.

Special Tools

J-33785 Installer

Equivalent regional tools:Special Tools.

REAR DIFFERENTIAL HYDRAULIC SYSTEM SERVICE FILL/BLEED

Rear Differential Hydraulic System Service Fill/Bleed Procedure

The rear differential hydraulic system service bleed is used to remove air from the system, check for proper system and solenoid function, and determine if full pressure can be achieved at the apply piston. Any time a rear differential hydraulic line is disconnected or any repairs are made, this procedure must be performed.

1. Connect scan tool and check the rear differential clutch control module for any DTCs and perform repairs as necessary. The scan tool may not allow the hydraulic system service bleed if certain DTCs are present.

2. Raise vehicle. Refer to Lifting and Jacking the Vehicle.

3. Remove the fill plug. Fill the Rear Drive Clutch fill hole to the appropriate level with the appropriate fluid.

Refer to Differential Clutch Oil Replacement, Approximate Fluid Capacities, and Adhesives, Fluids, Lubricants, and Sealers.

4. Install fill plug. Lower vehicle.

5. Ignition ON.

6. From the scan tool menu, select Rear Differential Clutch Control Module, then select Control Functions, then Rear Differential Hydraulic System Service Bleed.

NOTE: The Rear Differential Clutch Control Module can run this procedure. If this step does not pass, repeat procedure from step 2.

NOTE: Status will change to "Complete" when done.

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