GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

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

1

Check for low oil level in the transmission. Refer to Transmission Fluid Level Inspection.

Is the oil level OK?

Go to Step 2

Go to Step 3

2

Check the transmission for improper lubricant. Refer to Transmission Replacement.

Is the recommended lubricant being used?

Go to Step 5

Go to Step 4

3

Replenish the oil to the level of the oil fill plug.

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4

Drain and refill the transmission with the recommended lubricant. Refer to Transmission Fluid Replacement.

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5

Check for proper clutch operation.

Is the clutch operating properly?

Go to Step 6

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6

  1. Remove the transmission. Refer to Transmission Replacement.
  2. Disassemble the transmission. Refer to Transmission Disassemble.
  3. Look for the following list of causes:
  4. • Gearshift components are worn or damaged.
    • Synchronizer assemblies worn or damaged.
  5. Replace all worn or damaged parts.

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