Test Description
WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The numbers below refer to the step numbers on the diagnostic table.
- 8: This step inspects for the transfer case causing the clunk. Shift the transfer case into another mode. If the transmission is causing the clunk, there is not be a change.
- 11: This step inspects for the dual mass flywheel causing the clunk. A clunk from the dual mass flywheel would also be present in neutral.
Transmission Clunk on Acceleration or Deceleration
| Step | Action | Yes | No |
|---|---|---|---|
| DEFINITION: A clunk is heard and/or felt on acceleration or deceleration. | |||
| 1 | Did you review the Symptoms - Manual Transmission and perform the necessary inspections? | Go to Step 2 | Go toSymptoms - Manual Transmission |
| 2 | Inspect the engine mounts for being loose or damaged. Refer to Engine Mount Inspection
in Engine Mechanical - 6.6L or Engine Mount Inspection
in Engine Mechanical - 8.1L. Did you find and repair the condition? |
Go to Step 13 | Go to Step 3 |
| 3 | Inspect the transmission mounts for being loose or damaged. Refer to Transmission Mount Replacement . Did you find and repair the condition? |
Go to Step 13 | Go to Step 4 |
| 4 | Inspect the transmission to engine fasteners for being loose or missing. Refer to Fastener Tightening Specifications . Did you find and repair the condition? |
Go to Step 13 | Go to Step 5 |
| 5 | Inspect the exhaust hanger mounting bracket on the transmission for being loose or for missing fasteners. Refer to Exhaust Hanger Mounting Bracket Replacement (6.0L, 6.6L, and 8.1L Engines)
in Engine Exhaust. Did you find and repair the condition? |
Go to Step 13 | Go to Step 6 |
| 6 | Inspect the driveline for causing the clunk. Refer to Diagnostic Starting Point - Propeller Shaft
in Propeller Shaft. Did you find and repair the condition? |
Go to Step 13 | Go to Step 7 |
| 7 | Is the vehicle equipped with a transfer case? | Go to Step 8 | Go to Step 10 |
| 8 | Shift the transfer case into 4HI. Is the clunk still present? |
Go to Step 10 | Go to Step 9 |
| 9 | Inspect the transfer case for causing the clunk. Refer to Diagnostic Starting Point - Transfer Case
in Transfer Case - NVG 246-NP8 or Diagnostic Starting Point - Transfer Case
in Transfer Case - NVG 261-NP2. Did you find and repair the condition? |
Go to Step 13 | Go to Step 10 |
| 10 | Is the vehicle equipped with the 6.6L diesel engine? | Go to Step 11 | Go to Step 12 |
| 11 | Inspect the dual mass flywheel. Refer to Engine Flywheel Replacement - Manual Transmission
in Engine Mechanical - 6.6L. Did you find and repair the condition? |
Go to Step 13 | Go to Step 12 |
| 12 |
|
Go to Step 13 | Go to Diagnostic Aids |
| 13 | Operate the system in order to verify the repair. Did you correct the condition? |
System OK | Go to Step 1 |