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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 Jumps Out of 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:  A static shift test is performed by shifting into all gear positions with the engine not operating. While performing the test, slowly move the shift lever. Feel for proper movement of the shift lever and transmission internal shift components.
  2. 5:  A dynamic shift test is performed by shifting into all gear positions 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 release from the gear, then let up on the clutch pedal. Depress the clutch pedal and move the shift lever to engage the gear again, to ensure full travel of the shift components.
  3. 6:  This step inspects for worn or damaged transmission or engine mounts. Loose mounts may cause a shock on the transmission allowing for gear disengagement.
  4. 7:  This step inspects for the misalignment of the torque tube to transmission. Misalignment may put a bind on the input shaft, allowing for the input shaft or the mainshaft to tip.
  5. 9:  This step inspects the pilot bearing and the pilot bearing journal on the input shaft. A worn pilot bearing or input shaft may allow the input shaft to tip, causing gear disengagement.
Transmission Jumps Out of Gear

Step Action Yes No
DEFINITION: Gear disengagement occurs during acceleration or deceleration.
1 Did you review the Symptoms - Manual Transmission  operations and perform the necessary inspections? Go to Step 2  Go to Symptoms - Manual Transmission 
2 
  1. Perform a static shift test.
  2. Test for the following conditions:
    • Blockage preventing full shift lever movement
    • Excessive movement in the shift lever
    • Detent plungers engaging in the shift rails
    • Synchronizer pressure pieces on the synchronizer sleeves
    • Shift linkage binding
    • Shift linkage proper adjustment
Did the transmission shift completely into all gears?		 Go to Step 5  Go to Step 3 
3 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 11  Go to Step 4 
4 Inspect for proper shift linkage adjustment. Refer to Shift Linkage Adjustment .
Did you find and repair the condition?		 Go to Step 11  Go to Step 5 
5 
  1. Perform a dynamic shift test on the transmission.
  2. Test for the following conditions:
    • Synchronizer sleeve engagement to the speed gear selector teeth
    • Detent plungers engaging in the shift rails
Did the transmission shift completely into all gears?		 Go to Step 6  Go to Step 9 
6  Inspect the engine and/or transmission mounts. Refer to Transmission Mount Replacement in Rear Drive Axle and Engine Mount Inspection in Engine Mechanical - 5.7L.
Did you find and repair the condition?		 Go to Step 11  Go to Step 7 
7  Inspect the clutch housing for loose bolts or misalignment.
Are there any loose bolts or misalignment?		 Go to Step 10  Go to Step 9 
8 Tighten any loose housing bolts and/or align the housing. Refer to Clutch Assembly Replacement in Clutch.
Did you find and repair the condition?		 Go to Step 11  Go to Step 9 
9 
  1. Remove the transmission. Refer to Transmission Replacement .
  2. Remove the clutch assembly. Refer to Clutch Assembly Replacement in Clutch.
  3. Inspect the pilot bearing for being faulty.
  4. Inspect the input shaft for excessive wear at the pilot bearing.
Did you find and repair the condition?		 Go to Step 11  Go to Step 10 
10
  1. Disassemble the transmission. Refer to Transmission Disassemble (Y Car) Transmission Disassemble (CTSV) Transmission Disassemble (GTO) in the Transmission Unit Repair Manual.
  2. Inspect the following components for wear or damage:
    • The shift rails
    • The detent plungers and springs
    • The shift forks
    • The synchronizer sleeve and speed gear selector teeth
    • The mainshaft to input shaft bearing and journals
    • The speed gear bearings and journals
    • The speed gear axial clearance
    • The mainshaft center and rear bearings
Did you find and repair the condition?		 Go to Step 11  Go to Diagnostic Aids
11 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 1 
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