GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 4WD 🢒 Transmission/Transaxle 🢒 Manual Transmission - Tremec 5-Speed (TZ0) 🢒 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 inspect the engine mounts for being loose or damaged. Inspect for a worn or damaged clutch driven plate. The clunk noise may also come from worn or damaged universal joints.

Test Description

The number below refers to the step number on the diagnostic table.

  1. This step inspects for loose or damaged engine mounts.

    2.

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

    3.

  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 Symptoms - Manual Transmission and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Manual Transmission

2

Inspect the engine mounts for being loose or damaged. Refer to Engine Mount Inspection .

Did you find loose or damaged engine mounts?

Go to Step 3

Go to Step 4

3
  1. Tighten the engine mounts to specifications. Refer to Fastener Tightening Specifications .
  2. Replace the engine mounts. Refer to Engine Mount Replacement - Left Side or Engine Mount Replacement - Right Side .

Did you find and repair the condition?

System OK

Go to Step 4

4

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

Is the clutch driven plate worn or damaged?

Go to Step 5

System OK

5

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

Did you find and repair the condition?

System OK

Go to Step 6

6

Inspect the universal joints for wear or damage.

Are the universal joints worn or damaged?

Go to Step 7

System OK

7

Replace the universal joints. Refer to Universal Joint Replacement .

Did you find and repair the condition?

Go to Step 8

Go to Diagnostic Aids

8

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 1