GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: The transmission gears clash when shifting from one gear into another gear.

1

Check for proper clutch operation.

Does the clutch operate properly?

--

Go to Step 2

--

2

Verify that the clutch is releasing properly.

Is the clutch releasing properly?

--

Go to Step 4

Go to Step 3

3

Repair the clutch system. Refer to Release Bearing Replacement in Clutch.

Does the clutch release?

--

System OK

--

4

Check for air in the clutch hydraulic system.

Is there air in the hydraulic system?

--

Go to Step 5

Go to Step 6

5

Bleed the clutch hydraulic system. Refer to Hydraulic Clutch Bleeding in Clutch.

Do the gears still clash?

--

Go to Step 6

System OK

6

Inspect the transmission control for wear.

Is the transmission control worn?

--

Go to Step 7

Go to Step 8

7

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

Do the gears still clash?

--

Go to Step 8

System OK

8

Check the transmission fluid level. Refer to Transmission Fluid Level Inspection .

Do the gears still clash?

--

Go to Step 9

System OK

9

Check for the correct type transmission fluid.

Is the correct type transmission fluid being used?

--

Go to Step 11

Go to Step 10

10

Drain and refill the transmission. Refer to Transmission Oil Drain and Fill .

Do the gears clash?

--

Go to Step 11

System OK

11

  1. Remove the transmission. Refer to Transmission Replacement .
  2. Disassemble and inspect the gear shift components and/or synchronizers for damage or wear. Refer to Transmission/Transaxle/Transfer Case Unit Repair Manual.

Are the gear shift and/or synchronizers worn or damaged?

--

Go to Step 12

Go to Step 13

12

  1. Replace worn and/or damaged components as necessary.
  2. Install the transmission. Refer to Transmission Replacement .

Do the gears still clash?

--

--

System OK

13

Inspect the clutch pilot bearing for binding.

Is the pilot bearing binding?

--

Go to Step 14

--

14

  1. Replace the clutch pilot bearing. Refer to Clutch Pilot Bearing Replacement in Clutch.
  2. Install the transmission. Refer to Transmission Replacement .

Do the gears still clash?

--

--

System OK