GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Chevy C Cab/Chassis HD (GMT 400) 🢒 Transmission/Transaxle 🢒 Manual Transmission - NV 4500 🢒 Transmission Clunk on Acceleration or Deceleration

Diagnostic Aids

There are a few factors to know when there is a clunk in acceleration or deceleration. You should always check the engine mounts for looseness or damage. Also check the clutch driven plate to see if it is worn or damaged. Sometimes the clunk noise may come from worn or damaged universal joints.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. This step inspects for loose or damaged engine mounts

  2. This step inspects for worn or damaged driven clutch plate.

  3. This step inspects for worn or damaged universal joints.

Step

Action

Yes

No

DEFINITION: A clunk is heard and/or felt on acceleration or deceleration.

1

Did you review the manual transmission symptom and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Manual Transmission

2

Inspect the engine mounts for looseness or damage.

Did you find and repair the condition?

Go to Step 7

Go to Step 3

3

  1. Remove the transmission. Refer to Transmission Replacement .
  2. Inspect the clutch driven plate hub for wear or damage.

Did you find and repair the condition?

Go to Step 4

System OK

4
  1. Replace the clutch driven plate. Refer to Clutch Assembly Replacement in Clutch.
  2. Install the transmission. Refer to Transmission Replacement .

Did you find and repair the condition?

Go to Step 7

Go to Step 5

5

Inspect the driveline.

Are the universal joints worn or damaged?

Go to Step 6

Go to Step 7

6

Replace the universal joints. Refer to Universal Joint Replacement - External Snap Ring in Propeller Shaft.

Did you find and repair the condition?

Go to Step 7

Go to Diagnostic Aids

7

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 1