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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1507 (Manual Transmission -- TREMEC 6-Speed) >> Diagnostic Information and Procedures >> Transmission Does Not Shift into One Gear >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  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. 3:  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 in the next gear, and the synchronizer sleeve movement.
  3. 6:  A dynamic shift test is performed by shifting into all gears with the engine operating. Test for the correct mesh of the synchronizers sleeve and the speed gear selector teeth. Move the shift lever and feel for the synchronizer sleeve to just release from the gear, then let up on the clutch pedal. Depress the clutch pedal and move the shift lever to engage that gear again, to ensure full travel of the shift components.
Transmission Does Not Shift into One Gear

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 Symptoms - Manual Transmission  and perform the necessary inspections? Go to Step 2  Go to Symptoms - Manual Transmission 
2  Inspect the clutch system for slipping. Refer to Clutch Slipping in Clutch.
Is the clutch operating properly?		 Go to Step 2  Go to Clutch Assembly Replacement in Clutch
3 
  1. Perform a static shift test on the transmission.
  2. Test for the following conditions:
    • 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 6  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 9  Go to Step 5 
5 Inspect for proper shift linkage adjustment. Refer to Shift Linkage Adjustment .
Did you find and repair the condition?		 Go to Step 9  Go to Step 6 
6 
  1. Perform a dynamic shift test on the transmission.
  2. Test for the following conditions:
    • Detent plungers or shift rails binding
    • Synchronizer sleeve binding
    • Synchronizer sleeve engaging on the speed gear selector teeth
Were you able to shift into the gear position with the concern?		 Go to Step 8  Go to Step 7 
7
  1. Remove the transmission. Refer to Transmission Replacement .
  2. Disassemble the transmission. Refer to Transmission Disassemble (Y Car) Transmission Disassemble (CTSV) Transmission Disassemble (GTO) in the Transmission Unit Repair Manual.
  3. Inspect the following transmission internal components for wear or damage:
    • The shift forks
    • The internal shift control lever
Did you find and repair the condition?		 Go to Step 9  Go to Step 8 
8
  1. Remove the transmission. Refer to Transmission Replacement .
  2. Disassemble the transmission. Refer to Transmission Disassemble (Y Car) Transmission Disassemble (CTSV) Transmission Disassemble (GTO) in the Transmission Unit Repair Manual.
  3. Inspect the following transmission internal components for wear or damage:
    • The synchronizer 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 9  Go to Diagnostic Aids
9 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 1 
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