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Chevrolet Silverado / GMC Sierra. Manual - part 1408
REPAIR INSTRUCTIONS
REAR AXLE LUBRICANT LEVEL INSPECTION (11.5 INCH AXLE)
1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Make sure the vehicle is level.
3. Inspect the rear axle for leaks. Repair as necessary.
4. Clean the area around the rear axle fill plug.
Locking Differential Cam Unit Assemble (8.6 Inch
Axle) or Locking Differential Cam Unit Assemble
(9.5 Inch Axle)
Locking Differential Adjustment (8.6 Inch Axle) or
Locking Differential Adjustment (9.5 Inch Axle)
Locking Differential Assemble (9.5 Inch Axle)
The thrust block is broken
Replace the thrust block with a block of identical thickness.
Check closely for other damage. Refer to Locking
Differential Disassemble (8.6, 9.5LD Axles) and Locking
Differential Assemble (9.5 Inch Axle).
The case is damaged
Replace the unit. Refer to Differential Replacement (8.6,
9.5/9.5LD Inch Axles) or Differential Replacement (10.5
Inch, 11.5 Inch Axle).
The differential gears are
broken
Replace the gears. Refer to the following:
Locking Differential Disassemble (8.6, 9.5LD Axles)
Locking Differential Cam Unit Disassemble (9.5
Inch Axle)
Locking Differential Cleaning and Inspection
Locking Differential Cam Unit Assemble (8.6 Inch
Axle) or Locking Differential Cam Unit Assemble
(9.5 Inch Axle)
Locking Differential Adjustment (8.6 Inch Axle) or
Locking Differential Adjustment (9.5 Inch Axle)
Locking Differential Assemble (9.5 Inch Axle)
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 30: Identifying Rear Axle Fill Plug
Courtesy of GENERAL MOTORS CORP.
5. Remove the rear axle fill plug and the seal.
6. Inspect the lubricant level.
Specification: The lubricant level should be between 17-21 mm (0.6-0.8 in) below the fill
plug opening.
7. If the level is low, add lubricant until the level is between 17-21 mm (0.6-0.8 in) below the
fill plug opening. Use the proper fluid. Refer to Fluid and Lubricant
Recommendations .
8. Install the rear axle fill plug and gasket.
Tighten: Tighten the rear axle fill plug to 33 N.m (24 lb ft).
NOTE:
Refer to Fastener Notice .
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
9. Lower the vehicle.
REAR AXLE LUBRICANT LEVEL INSPECTION (8.6, 9.5 LD AXLE)
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Ensure the vehicle is level.
3. Inspect the rear axle for leaks. Repair as necessary.
4. Clean the area around the rear axle fill plug.
IMPORTANT: All axle assemblies are filled by volume of fluid during
production. They are not filled to reach a certain level. When
checking the fluid level on any axle, variations in the readings
can be caused by factory fill differences between the minimum
and the maximum fluid volume. Also, if a vehicle has just been
driven before checking the fluid level, it may appear lower than
normal because the fluid has traveled out along the axle tubes
and has not drained back to the sump area. Therefore, a reading
taken five minutes after the vehicle has been driven will appear to
have a lower fluid level than a vehicle that has been stationary for
an hour or two. Remember that the rear axle assembly must be
supported to get a true reading.
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 31: View Of Rear Axle Fill Plug
Courtesy of GENERAL MOTORS CORP.
5. Remove the rear axle fill plug.
6. Inspect the lubricant level:
Specification: The lubricant level should be between 1-19 mm (0.04-0.75 in) below
the fill plug opening for the 8.6 inch axle.
Specification: The lubricant level should be between 15-40 mm (0.59-1.57 in) below
the fill plug opening for the 9.5 inch LD axle.
7. If the level is low, add lubricant until the level is even with the bottom edge of the fill plug
opening. Use the proper fluid. Refer to Fluid and Lubricant Recommendations .
8. Install the rear axle fill plug.
Tighten: Tighten the rear axle fill plug to 33 N.m (24 lb ft).
9. Lower the vehicle.
NOTE:
Refer to Fastener Notice .
2008 Chevrolet Silverado 1500
2008 Driveline/Axle Rear Drive Axle - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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