Chevrolet Silverado / GMC Sierra. Manual — part 1257

CLUTCH GRABBING

5. Repair or replace the clutch hydraulic

hose if it is damaged. Refer to Clutch
Master Cylinder Replacement.

Grease or oil contamination of the clutch disc

1. Repair the source of the oil leak.

2. Repair the source of the grease leak.

3. Clean the contamination from the clutch

components.

4. If contaminates cannot be removed,

replace the clutch assembly. Refer to
Clutch Assembly Replacement.

Worn or damaged flywheel

Replace the engine flywheel. Refer to Engine
Flywheel Replacement for the 4.3L engine
or Automatic Transmission Flex Plate
Replacement for the 6.0L engine.

Worn clutch disc facing

Replace the clutch assembly. Refer to Clutch
Assembly Replacement.

Clutch discs splines worn

Replace the clutch assembly. Refer to Clutch
Assembly Replacement.

Low pedal from self-adjusted clutch adjusted
forward

Replace the clutch assembly. Refer to Clutch
Assembly Replacement.

Burnt or glazed clutch discs

Replace the clutch assembly. Refer to Clutch
Assembly Replacement.

Input shaft splines worn

Replace the input shaft. Refer to
Transmission Disassemble for the Tremec
5-Speed (M96) or Transmission
Disassemble for the Tremec 5-Speed (TZO).

Improper resurfacing of the flywheel

Replace the flywheel if it has been
improperly resurfaced, allowing contact of
the clutch disc hub or insufficient clamping
load of the pressure plate. Refer to Engine
Flywheel Replacement for the 4.3L engine
or Automatic Transmission Flex Plate
Replacement for the 6.0L engine.

Cause

Action

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Clutch - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

DEFINITION: The clutch grabs, or chatters, or the clutch is unable to release without the
vehicle jerking. An abrupt engagement of the clutch.
Review the Symptoms - Clutch and perform the necessary inspections.
Grease or oil contamination on the clutch
facings

1. Repair the cause of the oil leak or

grease contamination.

2. Clean the clutch facings.

3. Replace the clutch components if they

will not clean. Refer to Clutch
Assembly Replacement.

Loose or faulty engine mounts

1. Inspect the engine mounts for being

loose or faulty. Refer to Engine Mount
Inspection for the 4.3L engine or
Engine Mount Inspection for the 6.0L
engine.

2. Repair or replace the engine mounts as

required. Refer to Engine Mount
Replacement - Left Side and Engine
Mount Replacement - Right Side for
the 4.3L engine 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) and 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) for the 6.0L engine.

Clutch pedal sticking

1. Inspect the clutch pedal for correct

operation.

2. Replace the clutch pedal if it is faulty.

Refer to Clutch Pedal Replacement.

Clutch actuator binding

1. Inspect the clutch actuator for the piston

seals binding or sticking in the seal bore.

2. Replace the clutch actuator if it is

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Clutch - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado

binding. Refer to Clutch Actuator
Cylinder Replacement (TZ0) or
Clutch Actuator Cylinder
Replacement (M96).

Clutch master cylinder binding

1. Inspect the clutch master cylinder for

the piston binding or sticking in the
cylinder.

2. Replace the master cylinder if it is

faulty. Refer to Clutch Master
Cylinder Replacement.

Improper clutch installation

1. Inspect the pressure plate for distortion

caused by improperly tightening the
pressure plate bolts.

2. Inspect the clutch disc for a bent hub

caused by forcing the installation of the
transmission.

3. Inspect for the correct clutch disc.

4. Inspect the clutch disc for being

installed backwards.

5. Replace the clutch assembly if it is

damaged or the wrong components were
installed. Refer to Clutch Assembly
Replacement.

Clutch disc binding on the input shaft

1. Inspect the input shaft for rust dirt or

debris.

2. Clean the input shaft.

3. Inspect the clutch disc for a bent hub.

4. Replace the clutch assembly if the clutch

disc is faulty. Refer to Clutch
Assembly Replacement.

5. Inspect the input shaft for excessive

wear on the splines, causing the clutch
disc to bind.

6. Replace the transmission input shaft if it

is worn. Refer to Transmission
Disassemble for the Tremec 5-Speed

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Clutch - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado