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Home >> Chevrolet >> 2024 >> Camaro SS, 2D Convertible, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Manual Transmission - TREMEC 6-Speed (M13 MJK Mm6 MH3) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Transmission Shifts Hard (MJK, MH3, or MM6) >> 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. 3 

    A static shift test is performed by shifting into all of the gear positions with the engine not operating. While performing the test, one should note how the shift lever movement is felt. Also while shifting from one gear to the other, feel for binding in the shift rails. You should be able to feel the detent plungers operating when coming out of a gear and when going into a gear.

  2. 5 

    A dynamic shift test is performed by shifting into one of the gear positions with the engine operating. Test for the correct mesh of the synchronizers and for the clutch releasing correctly. When shifting into a gear, and shifting out of a gear, you should feel the shift detent plungers operating, and the synchronizers sleeve moving freely.

  3. 6 

    The transmission uses a transmission fluid that allows proper synchronizer operation. The incorrect fluid may cause hard shifting from varnish build up, or from not enough lubrication for proper synchronizer operation. Only use the proper transmission fluid.

Step Action Yes No
DEFINITION: The transmission does not shift smoothly or without difficulty from one gear to the other.
1 Did you review the Symptoms - Manual Transmission (MJK, MH3, or MM6) Symptoms - Manual Transmission (M13)  operations and perform the necessary inspections? Go to Step 2  Go to Symptoms - Manual Transmission (MJK, MH3, or MM6) Symptoms - Manual Transmission (M13) 
2 Inspect the clutch system for proper operation. Refer to Clutch System Description and Operation .
Did you find or repair the condition?		 Go to Step 11  Go to Step 3 
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
    • Shift linkage binding
    • Shift linkage proper adjustment
Are you able to shift into all gears?		 Go to Step 7  Go to Step 4 
4 Remove the shift control shift closeout boot and foam isolator. Refer to Transmission Control Lever Knob Replacement .
Inspect for the following:
  • Loose mounting
  • Foreign debris
  • Interference to foam isolator

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:
    • Detent plungers or shift rails binding
    • Synchronizer sleeve binding
    • Gear clash into only one gear
    • Gear clash into all gears
Did the transmission shift hard into all gears?		 Go to Step 6  Go to Step 10 
6  Inspect the transmission for the correct fluid level and the correct type of transmission fluid. Refer to Transmission Fluid Drain and Fill (M13 Without Y4Q)Transmission Fluid Drain and Fill (MH3, MJK, MM6)Transmission Fluid Drain and Fill (M13 With Y4Q Track Pack With or Without KNR) , and Approximate Fluid Capacities (MJK, MH3, or MM6)Approximate Fluid Capacities (M13) .
Is the transmission at the correct level and proper fluid being used?		 Go to Step 8  Go to Step 7 
7 Drain and fill the transmission with the correct type fluid. Refer to Transmission Fluid Drain and Fill (M13 Without Y4Q)Transmission Fluid Drain and Fill (MH3, MJK, MM6)Transmission Fluid Drain and Fill (M13 With Y4Q Track Pack With or Without KNR) .
Did you find and repair the condition?		 Go to Step 11  Go to Step 8 
8
  1. Remove the transmission. Refer to Transmission Replacement (MM6 with LT1 Engine, MH3 or MJK with LT4 Engine)Transmission Replacement (M13 with LGX Engine) .
  2. 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 9  Go to Step 10 
9 Replace the clutch assembly. Refer to Clutch Assembly Replacement (M13)Clutch Assembly Replacement (MJK, MH3, MM6) .
Did you find and repair the condition?		 Go to Step 11  Go to Step 10 
10
  1. Disassemble the transmission. Refer to Transmission Disassemble (M13 - LGX with Y4Q)Transmission Disassemble (MJK, MH3, or MM6)Transmission Disassemble (M13 - LGX without Y4Q, LTG) .
  2. Inspect the transmission for the following faulty components in the gear that is hard to shift or clashing:
    • Excessive synchronizers blocking ring to gear clearance
    • Synchronizer hub external splines worn or damaged
    • Excessive axial clearance in the speed gear
    • Mainshaft to speed gear bearing or journal worn
    • Shift rail and the internal shift control lever components for wear or damage
  3. Replace worn or damaged components as necessary.
Did you find and repair the condition?		 Go to Step 10  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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