GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value

Yes

No

DEFINITION: A noise is present in the locking rear axle.

1

Inspect for broken clutch plates. Refer to Locking Differential Disassemble .

Are the clutch plates broken?

--

Go to Step 2

Go to Step 3

2

Replace the clutch plates.

Is a noise still present in the locking rear axle?

--

Go to Step 3

System OK

3

Inspect for a broken thrust block. Refer to Locking Differential Disassemble .

Is the thrust block broken?

--

Go to Step 4

Go to Step 5

4

  1. Replace the thrust block with a block of identical thickness.
  2. Inspect closely for other damage.

Is a noise still present in the locking rear axle?

--

Go to Step 5

System OK

5

Inspect for broken differential gears. Refer to Locking Differential Disassemble .

Are the differential gears broken?

--

Go to Step 6

Go to Step 7

6

Replace the differential gears.

Is a noise still present in the locking rear axle?

--

Go to step 7

System OK

7

Inspect for a damaged differential case. Refer to Locking Differential Disassemble .

Is the differential case damaged?

--

Go to Step 8

System OK

8

Replace the differential case.

Is the repair complete?

--

System OK

--