GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Omega VE 🢒 Transmission/Transaxle 🢒 Manual Transmission - Tremec 6-Speed 🢒 Transmission Does Not Shift into One Gear

Diagnostic Aids

If the transmission shifts into gear and then jumps out of gear, refer to Transmission Jumps Out of Gear . If it is an intermittent condition, other driveline components may be faulty.

Test Description

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

  1. This test is to confirm that the clutch is not slipping. During certain conditions, the clutch may slip and feel as though the transmission is not in gear.

  2. A static shift test is performed by shifting into all gears with the engine not operating. While performing the test, you should note how the shift lever movement feels. Also feel for the shift rails moving freely, the detent plungers operating when coming out of a gear and going into the next gear, and for the synchroniser sleeve movement.

  3. A dynamic shift test is performed by shifting into all gears with the engine operating. Test for the correct mesh of the synchronisers sleeve and the speed gear selector teeth. Move the shift lever and feel for the synchroniser sleeve to just release from the gear, then let up on the clutch pedal. Press the clutch pedal and move the shift lever to engage that gear again, to Make sure full travel of the shift components.

Step

Action

Yes

No

DEFINITION: The shift lever will not move into a particular gear position, or when in a gear position, power is not delivered through the transmission.

1

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

Go to Step 2

Go to Symptoms - Manual Transmission .

2

Inspect the clutch system for slipping. Refer to Clutch Slipping .

Is the clutch operating properly?

Go to Step 2

Go to Clutch Assembly Replacement

3

  1. Perform a static shift test on the transmission.
  2. Test for the following conditions:
    3. • Blockage preventing full shift lever movement.
    • Excessive movement in the shift lever.
    • Binding in the shift lever.
    • Detent plungers or shift rails binding.
    • Synchronizer sleeve moving on the hub and pressure pieces.
    • Shift linkage binding.
    • Shift linkage proper adjustment.

Were you able to shift into the gear position with the concern?

Go to Step 5

Go to Step 4

4

Remove the shift control shift closeout boot. Refer to Shift Control Shift Closeout Boot Replacement .

Inspect for the following:

    • Loose mounting.
    • Foreign debris.

Did you find and repair the condition?

Go to Step 8

Go to Step 5

5
  1. Perform a dynamic shift test on the transmission.
  2. Test for the following conditions:
    3. • Detent plungers or shift rails binding.
    • Synchroniser sleeve binding.
    • Synchroniser sleeve engaging on the speed gear selector teeth.

Were you able to shift into the gear position with the concern?

Go to Step 7

Go to Step 6

6

  1. Remove the transmission. Refer to Transmission Replacement .
  2. Disassemble the transmission. Refer to one of the following: Transmission Disassemble .
  3. Inspect the following transmission internal components for wear or damage:
    4. • The shift forks.
    • The internal shift control lever.

Did you find and repair the condition?

Go to Step 8

Go to Step 7

7
  1. Remove the transmission. Refer to Transmission Replacement .
  2. Disassemble the transmission. Refer to one of the following: Transmission Disassemble .
  3. Inspect the following transmission internal components for wear or damage:
    4. • The synchroniser sleeve selector teeth.
    • The speed gear selector teeth.
    • The speed gear axial clearance for being excessive.
    • The speed gear to mainshaft bearings and journals.
    • The countershaft for being broken.
    • The mainshaft for being broken.
    • The countershaft gear for being stripped.
    • The mainshaft gear for being stripped.

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