Chevrolet Silverado / GMC Sierra. Service manual — part 1356

BRACKET REPLACEMENT (25, 35 SERIES)

Removal Procedure

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

2. Remove the differential carrier assembly. Refer to Differential Carrier Assembly

Replacement (1500 FWD) or Differential Carrier Assembly Replacement (2500
4WD).

3. For the 6.0L engine, remove the air conditioning compressor. Refer to Air Conditioning

Compressor Replacement (LY2, LY5, LH6, L76, L92 and LMG) or Air Conditioning
Compressor Replacement (LLY/LMM) or Air Conditioning Compressor
Replacement (LU3) .

Fig. 131: Front Axle Mounting Bracket - Front Drive Axle (8.25 S4WD and 9.25
Axles)

Tighten: 100 N.m (74 lb ft)

2

Front Differential Carrier Mounting Bracket Nut (Qty: 4)

3

Front Differential Carrier Mounting Bracket Left

4

Front Differential Carrier Mounting Bracket Right

2008 Chevrolet Silverado 1500

2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Courtesy of GENERAL MOTORS CORP.

4. Remove the nuts and the washers from the bracket.

5. Remove the bracket from the vehicle.

Installation Procedure

Fig. 132: Front Axle Mounting Bracket - Front Drive Axle (8.25 S4WD and 9.25
Axles)
Courtesy of GENERAL MOTORS CORP.

1. Install the bracket to the vehicle.

2. Install the washers and the nuts to the bracket.

Tighten: Tighten the bracket to frame nuts to 90 N.m (67 lb ft).

3. For the 6.0L engine, install the air conditioning compressor. Refer to Air Conditioning

Compressor Replacement (LY2, LY5, LH6, L76, L92 and LMG) or Air Conditioning

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

Compressor Replacement (LLY/LMM) or Air Conditioning Compressor
Replacement (LU3) .

4. Install the differential carrier assembly. Refer to Differential Carrier Assembly

Replacement (1500 FWD) or Differential Carrier Assembly Replacement (2500
4WD).

5. Lower the vehicle.

FRONT AXLE LUBRICANT LEVEL INSPECTION (9.25 INCH AXLE)

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

2. Make sure the vehicle is level.

3. Inspect the front axle for leaks. Repair as necessary.

4. Clean the area around the front axle fill plug.

Fig. 133: View Of Front Axle Fill Plug
Courtesy of GENERAL MOTORS CORP.

2008 Chevrolet Silverado 1500

2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

5. Remove the front axle fill plug (1).

6. Inspect the oil level.

Specification: The 9.25 inch axle the oil level should be between 0-6 mm (0-0.25 in)
below the fill plug opening.

7. If the level is low, add oil until the level is between 0-6 mm (0-0.25 in) for the 9.25 inch

axle. Use the correct fluid. Refer to Sealers, Adhesives, and Lubricants.

8. Install the fill plug.

Tighten: Tighten the plug to 33 N.m (24 lb ft).

9. Lower the vehicle.

FRONT DRIVE AXLE CLUTCH FORK INSPECTION

Inspect the carrier connector for damaged splines and teeth. Replace as required.

Inspect the shift fork for wear, scoring, and damage to the thrust surfaces. Replace as
required.

Inspect the differential sleeve and the inner output shaft for damaged splines and teeth.
Replace as required.

Inspect the damper spring for breakage. Replace or repair the damper spring as needed.

Inspect the differential actuator and the engagement switch for damage and frayed wiring.

INNER AXLE SHAFT SHIM ADJUSTMENT

Tools Required

J 34672 Depth Micrometer. See Special Tools.

J 34673 Flat Gage Bar. See Special Tools.

J 8001 Dial Indicator Set

Adjustment

The front drive axle clutch gear shim needs to be measured and adjusted if any of the following
parts are replaced:

NOTE:

Refer to Fastener Notice .

2008 Chevrolet Silverado 1500

2008 Driveline/Axle Front Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado