Chevrolet Silverado / GMC Sierra. Service manual — part 2592

TRANSMISSION SHIFTS HARD INTO REVERSE

Diagnostic Aids

Hard shifting in reverse can be diagnosed easily. You should perform a static shift and dynamic
shift test also. Many simple factors could occur such as, excessive clutch pedal free travel,

used?

Go to Step 10

Go to Step 9

9

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 10

10

Inspect the clutch pressure plate and/or clutch
driven plate.
Is the clutch pressure plate and/or clutch driven
plate worn or faulty?

Go to Step 11

Go to Step 12

11

Replace the clutch pressure plate and/or clutch
driven plate. Refer to Clutch Assembly
Replacement .
Did you find and repair the condition?

System OK

Go to Step 12

12

1. Remove the transmission. Refer to

Transmission Replacement.

2. Inspect the transmission for an internal

bind, possibly caused by one of the
following components:

Shift forks

Selector plates

Synchronizers

Is there an internal bind?

Go to Step 13

System OK

13

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 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

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (TZ0)

insufficient fluid, excessive fluid, or the wrong transmission lubricant. A misaligned transmission
can also cause hard shifting, as well as a worn or defective clutch, binding of the shift control.
Many internal components can also play a factor in hard shifting such as, the front bearing
retainer loose or cracked, the synchronizer worn, damaged, or improperly assembled. A failure to
fully depress the clutch pedal when shifting causes hard shifting in reverse.

Test Description

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

4: This step inspects for air in the hydraulic lines, which also causes the transmission to shift
hard in reverse.

6: This step inspects for a faulty shift control.

10: This step inspects for a faulty or worn clutch pressure plate or clutch driven plate.

Step

Action

Yes

No

DEFINITION: The transmission does not shift smoothly or without difficulty from one gear
to another.

1

Did you review the Symptoms - Manual
Transmission operations and perform the
necessary inspections?

Go to Step 2

Go to Symptoms
- Manual
Transmission

2

Inspect the clutch pedal travel.
Is there sufficient clutch pedal travel?

Go to Step 3

Go to Step 4

3

Remove any clutch pedal restrictions.
Does the transmission shift hard in reverse?

Go to Step 4

System OK

4

Test for air in the clutch hydraulic system.
Is there air in the hydraulic system?

Go to Step 5

Go to Step 6

5

Bleed the air from the clutch hydraulic system.
Refer to Hydraulic Clutch Bleeding .
Did you find and repair the condition?

System OK

Go to Step 6

6

Inspect the transmission shift control for
binding.
Is the transmission shift control binding?

Go to Step 7

Go to Step 8

7

Replace the transmission shift tower.
Did you find and repair the condition?

System OK

Go to Step 8

8

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

Go to Step 10

Go to Step 9

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (TZ0)

TRANSMISSION GEAR CLASH WHEN SHIFTING GEARS

Diagnostic Aids

Gear clash is a grinding noise that is made while shifting gears. You should perform a static shift
and dynamic shift test. If the transmission develops gear clash, first inspect the clutch adjustment
or for a faulty clutch condition. A clutch that drags or does not fully engage is the most common

9

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 10

10

Inspect the clutch pressure plate and/or clutch
driven plate.
Is the clutch pressure plate and/or clutch driven
plate worn or faulty?

Go to Step 11

Go to Step 12

11

Replace the clutch pressure plate and/or clutch
driven plate. Refer to Clutch Assembly
Replacement .
Did you find and repair the condition?

System OK

Go to Step 12

12

1. Remove the transmission. Refer to

Transmission Replacement.

2. Inspect the transmission for an internal

bind, possibly caused by one of the
following components:

Shift forks

Selector plates

Synchronizers

Is there an internal bind?

Go to Step 13

System OK

13

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 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

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (TZ0)

cause of gear clash. If the clutch is at fault, the clash should occur in every gear. If the clutch is
operating properly or the clash does not occur in all gears, remove the transmission and inspect
for worn or damaged synchronizers, including the sleeves, hubs, and the blocking rings. Also
inspect for loose mounting bolts or misalignment.

Test Description

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

2: This step inspects for proper clutch operations.

5: This step inspects for air the hydraulic clutch system.

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

Step

Action

Yes

No

DEFINITION: The transmission gears clash while shifting from one gear into another 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 for proper clutch operation. Refer to
Symptoms - Clutch .
Does the clutch operate properly?

Go to Step 3

Go to Step 3

3

Verify that the clutch is releasing properly.
Refer to Clutch System Description and
Operation .
Is the clutch releasing properly?

Go to Step 5

Go to Step 4

4

Repair the clutch system. Refer to Clutch
Assembly Replacement .
Did you find and repair the condition?

System OK

Go to Step 5

5

Test for air in the clutch hydraulic system.
Is there air in the hydraulic system?

Go to Step 6

Go to Step 7

6

Bleed the clutch hydraulic system. Refer to
Hydraulic Clutch Bleeding .
Did you find and repair the condition?

System OK

Go to Step 7

7

Inspect the transmission control for wear.
Is the transmission control worn?

Go to Step 8

Go to Step 9

8

Replace the transmission shift tower.
Did you find and repair the condition?

System OK

Go to Step 9

Inspect the transmission fluid level. Refer to

2008 Chevrolet Silverado 1500

2008 TRANSMISSION Manual Transmission - Tremec 5-Speed (TZ0)