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Home >> Chevrolet >> 2020 >> Camaro SS, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Manual Transmission - TREMEC 6-Speed (M13 MJK Mm6 MH3)) >> Diagnostic Information and Procedures >> Transmission Jumps Out of Gear >> Test Description

Test Description

WARNING: This page is about a different variant/trim than selected.

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 engine 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.

Step Action Yes No
DEFINITION: Gear disengagement occurs during acceleration or deceleration.
1 Did you review the Symptoms - Manual Transmission (MJK, MH3, or MM6) , or Symptoms - Manual Transmission (M13)  operations and perform the necessary inspections? Go to Step 2  Go to Symptoms - Manual Transmission (MJK, MH3, or MM6) , or Symptoms - Manual Transmission (M13) 
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
  1. Remove the shift control shift closeout boot and foam isolator. Refer to Transmission Control Lever Knob Replacement .
  2. Inspect for the following:
    • Loose mounting
    • Foreign debris
    • Interference to foam isolator
Did you find and repair the condition?		 Go to Step 10  Go to Step 4 
4
  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 5  Go to Step 8 
5  Inspect the engine and/or transmission mounts. Refer to Transmission Mount Inspection , and Engine Mount Inspection .
Did you find and repair the condition?		 Go to Step 10  Go to Step 6 
6  Inspect the clutch housing for loose bolts or misalignment.
Are there any loose bolts or misalignment?		 Go to Step 9  Go to Step 8 
7  Tighten any loose housing bolts and/or align the housing. Refer to Clutch Assembly Replacement (M13 Transmission) , or Clutch Assembly Replacement (MJK, MH3, MM6) .
Did you find and repair the condition?		 Go to Step 10  Go to Step 8 
8
  1. Remove the transmission. Refer to Transmission Replacement (MM6 with LT1 Engine, MH3 or MJK with LT4 Engine) , or Transmission Replacement (M13 with LGX Engine) , or Transmission Replacement (M13 with LTG Engine) .
  2. Remove the clutch assembly. Refer to Clutch Assembly Replacement (M13 Transmission) , or Clutch Assembly Replacement (MJK, MH3, MM6) .
  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 10  Go to Step 9 
9 
  1. Disassemble the transmission. Refer to Transmission Disassemble (M13 - LGX with Y4Q) , or Transmission Disassemble (MJK, MH3, or MM6) , or Transmission Disassemble (M13 - LGX without Y4Q, LTG) .
  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
    • The shift guide plate
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 
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