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Chevrolet Silverado / GMC Sierra. Manual - part 2520
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.
2: This step inspects for loose or damaged engine mounts.
4: This step inspects for a worn or damaged clutch driven plate.
6: This step inspects for worn or damaged universal joints.
for a dented or damaged shift fork.
Did you find a dented or damaged shift fork?
Go to Step 9
Go to Step 10
9
1. Replace worn or damaged components, as
necessary.
2. Install the transmission. Refer to
Transmission Replacement.
Did you find and repair the condition?
System OK
Go to Step 10
10
Disassemble and inspect the transmission for an
incorrectly assembled or broken shift
mechanism.
Did you find an incorrectly assembled or
broken shift mechanism?
Go to Step 11
System OK
11
1. Replace worn or damaged components, as
necessary.
2. Install the transmission. Refer to
Transmission Replacement.
Did you find and repair the condition?
Go to Step 12
Go to Diagnostic
Aids
12
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 1
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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 - Right
Side (1500 LH6, LMG, LY5, L76 and
L92) or Engine Mount Replacement -
Right Side (1500 LY2) or Engine
Mount Replacement - Right Side (2500
LY6) or Engine Mount Replacement -
Left Side (1500 LY2) or Engine Mount
Replacement - Left Side (1500 LH6,
LMG, LY5, L76 and L92) or Engine
Mount Replacement - Left Side
(2500LY6) .
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
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
REPAIR INSTRUCTIONS - ON VEHICLE
TRANSMISSION REAR MOUNT REPLACEMENT
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 - Nylon Injected Ring or
Universal Joint Replacement - External
Snap Ring .
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
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
Fig. 6: Transmission Rear Mount
Courtesy of GENERAL MOTORS CORP.
TRANSMISSION CONTROL REPLACEMENT
Callout
Component Name
Preliminary Procedures
1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
2. Support the transmission with a transmission jack.
1
Transmission Mount Nut
Tighten:: 40 N.m (30 lb ft).
NOTE:
Refer to Fastener Notice .
2
Transmission Mount Bolt (Qty: 2)
Tighten:: 50 N.m (37 lb ft).
3
Transmission Mount
Procedure:
Raise the transmission with the jack enough to remove the transmission mount.
2008 Chevrolet Silverado 1500
2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis
Silverado, Sierra & Silverado
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