Chevrolet Silverado / GMC Sierra. Service manual — part 2519

7

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)

Transmission Replacement

Did you find and repair the condition?

System OK

Go to Step 8

8

Inspect the engine and/or transmission mounts
for loose fasteners.
Did you find any loose fasteners?

Go to Step 9

Go to Step 10

9

Tighten the engine mount and/or transmission
mount fasteners to specifications. Refer to
Fastener Tightening Specifications.
Did you find and repair the condition?

System OK

Go to Step 10

10

Inspect the clutch housing for loose bolts or
misalignment.
Did you find any loose bolts or misalignment?

Go to Step 11

Go to Step 12

11

Tighten any loose housing bolts and/or align the
housing. Refer to Fastener Tightening
Specifications .
Did you find and repair the condition?

System OK

Go to Step 12

12

1. Remove the transmission. Refer to

Transmission Replacement.

2. Disassemble and inspect the following

internal components for wear or damage:

Gearshift

Transmission gears

Bearings

Did you find any worn or damaged
components?

Go to Step 13

System OK

13

1. Replace worn or damaged components, as

necessary.

2. Install the transmission. Refer to

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

TRANSMISSION DOES NOT SHIFT INTO ONE GEAR

Diagnostic Aids

When the manual transmission will not transmit power from the engine to the wheels and one gear
will not shift, it is possible that the gear is stripped. You should also perform a static shift and
dynamic shift test. If the transmission will not shift in all gears, it is possible the input or
countershaft gears are stripped or there is a broken input or output shaft. Sometimes the
transmission shift control may not be operating properly.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

2: This step inspects for worn or damaged shift control components.

4: This step inspects for any conditions with the hydraulic system.

8: This step inspects for worn or damaged internal components.

Transmission Replacement.

Did you find and repair the condition?

Go to Step 14

Go to Diagnostic

Aids

14

Operate the system in order to verify the repair.
Did you correct the condition?

System OK

Go to Step 1

Step

Action

Yes

No

DEFINITION: The transmission does not shift into a gear.

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 transmission shift lever operation.
Is the control worn, binding, or damaged?

Go to Step 3

Go to Step 3

3

Replace the transmission shift lever. Refer to
Transmission Control Lever Knob
Replacement and Transmission Control
Lever Boot Replacement.
Did you find and repair the condition?

System OK

Go to Step 4

4

Inspect the hydraulic clutch operation. Refer to
Symptoms - Clutch .
Is the clutch operating properly?

Go to Step 6

Go to Step 5

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado

TRANSMISSION LOCKED IN ONE GEAR

Diagnostic Aids

5

Replace the concentric slave cylinder.
Did you find and repair the condition?

System OK

Go to Step 6

6

1. Remove the transmission. Refer to

Transmission Replacement.

2. Inspect the transmission input shaft and the

clutch pilot bearing.

Is there signs of the input shaft binding in the
pilot bearing?

Go to Step 7

Go to Step 8

7

1. Inspect the clutch pilot bearing for

damage.

2. Replace the clutch pilot bearing. Refer to

Clutch Pilot Bearing Replacement .

Did you find and repair the condition?

System OK

Go to Step 8

8

Disassemble and inspect the following
transmission internal components for wear or
damage:

Gearshift components

Transmission gears

Bearings

Did you find any worn or damaged
components?

Go to Step 9

System OK

9

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 10

Go to Diagnostic

Aids

10

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

If the transmission is locked, engaging the clutch will stop the engine. If the shift control
components and the clutch system operations are operating properly, the condition is caused by
internal damage, such as a dented or damaged shift fork. The transmission must be removed from
the vehicle for repairs. You should also perform a static shift test and dynamic shift test.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

6: This step inspects for a faulty actuator cylinder.

8: This step inspects for a dented or damaged shift fork.

Step

Action

Yes

No

DEFINITION: The transmission cannot be shifted out of a gear.

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 transmission fluid level. Refer to
Transmission Fluid Replacement.
Is the transmission fluid level correct?

Go to Step 4

Go to Step 3

3

Add transmission fluid, if necessary.
Can you shift the transmission out of gear?

System OK

Go to Step 5

4

Inspect for the correct type of transmission
fluid.
Is the correct type of transmission fluid being
used?

Go to Step 6

Go to Step 5

5

Drain the transmission fluid and fill the
transmission with the correct type of fluid.
Refer to Transmission Fluid Replacement.
Did you find and repair the condition?

System OK

Go to Step 6

6

Inspect the concentric slave cylinder operation.
Refer to Symptoms - Clutch .
Is the clutch actuator operating properly?

Go to Step 8

Go to Step 7

7

Replace the concentric slave cylinder.
Did you find and repair the condition?

System OK

Go to Step 8

8

1. Remove the transmission. Refer to

Transmission Replacement.

2. Disassemble and inspect the transmission

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (M96) - Cab & Chassis Sierra, Cab & Chassis

Silverado, Sierra & Silverado