GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: Gear disengagement occurs during normal operation.

1

Inspect the transmission shift control closeout boot.

Is the closeout boot out of position?

--

Go to Step 2

Go to Step 3

2

Reposition or replace the closeout boot. Refer to Shift Control Shift Closeout Boot Replacement .

Does the transmission jump out of gear?

--

Go to Step 3

System OK

3

Inspect the transmission shift control.

Is the shift control loose or damaged?

--

Go to Step 4

Go to Step 5

4

Replace the transmission shift control. Refer to Shift Control Assembly Replacement .

Does the transmission jump out of gear?

--

Go to Step 5

System OK

5

Inspect the engine and/or transmission mounts.

Are the engine and/or transmission mounts worn or damaged?

--

Go to Step 6

Go to Step 7

6

Replace the engine mounts and/or transmission mounts. Refer to Engine Mount Replacement in Engine Mechanical - 5.7 L or Transmission Support and Mount Assembly Replacement .

Does the transmission jump out of gear?

--

Go to Step 9

System OK

7

Inspect the engine and/or transmission mounts for loose fasteners.

Are there any loose fasteners?

--

Go to Step 8

Go to Step 9

8

Tighten the engine mount and/or transmission mount fasteners to specifications. Refer to Fastener Tightening Specifications in Engine Mechanical - 5.7 L.

does the transmission still jump out of gear?

--

--

System OK

9

Inspect the clutch housing for loose bolts or misalignment.

Are there any loose bolts or misalignment?

--

Go to Step 10

Go to Step 11

10

Tighten any loose housing bolts and/or align the housing . Refer to Clutch Housing Replacement in Clutch.

Does the transmission still jump out of gear?

--

--

System OK

11

  1. Remove the transmission. Refer to Transmission Replacement .
  2. Disassemble and inspect the following internal components for wear or damage:
    • Gearshift
    • Transmission gears
    • Bearings

Is there any worn or damaged components?

--

Go to Step 12

--

12

  1. Replace any worn or damaged components. Refer to Transmission/Transaxle/Transfer Case Unit Repair Manual.
  2. Install the transmission. Refer to Transmission Replacement .

Does the transmission still jump out of gear?

--

--

System OK