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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 198 (Manual Transmission - TREMEC 6-Speed (M3L Mg9)) >> Repair Instructions - Off Vehicle >> Transmission Disassemble (M3L) >> Shift Shaft Assemblies and Gear Cluster Removal

Shift Shaft Assemblies and Gear Cluster Removal

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Coiled Spring Pin
    GM4142448Courtesy of GENERAL MOTORS COMPANY
  1. Using a 3/16 in drift punch and hammer drive the coiled spring pin downward and remove.
    2. Fig 2: Main Shaft Rear Bearing Race And Spacers
    GM4562695Courtesy of GENERAL MOTORS COMPANY
  2. Remove the spacer (1), main shaft rear bearing race (2), and main shaft bearing spacer (3).
  3. Using DT-22888-20A  puller with DT-22888-60  legs, remove the reverse gear and synchronizer (4) together as an assembly.
    4. Fig 3: Reverse Gear Bearing Assembly And Bushing
    GM4142454Courtesy of GENERAL MOTORS COMPANY
  4. Remove the reverse gear bearing assembly (1) and bushing (2).
    5. Fig 4: 3rd Gear Assembly And 3rd & 4th Gear Spacer
    GM4562694Courtesy of GENERAL MOTORS COMPANY
  5. Using DT-22888-20A  puller with DT-22888-60  legs, remove the 3rd gear assembly (1) and the 3rd & 4th gear spacer (2).
    6. Fig 5: Inner Bearing Race, Retainer, Reverse Drive Gear Assembly And Retainer
    GM4562698Courtesy of GENERAL MOTORS COMPANY
  6. Using snap ring pliers, remove the inner bearing race retainer (1), then remove the race (2) from the shaft.
  7. Using snap ring pliers, remove the reverse gear assembly retainer (3).
  8. Using DT 22888-D  Right Differential Side Bearing Puller remove the reverse drive gear assembly (2).
    9. Fig 6: 3rd Gear Thrust Washer And Drive Gear Assembly
    GM4142463Courtesy of GENERAL MOTORS COMPANY
  9. Remove the 3rd gear thrust washer (1) and the 3rd gear drive gear assembly (2).
    10. Fig 7: 3rd Gear Blocking Ring Assemblies And Bearing Assembly
    GM4142465Courtesy of GENERAL MOTORS COMPANY
  10. Remove the 3rd gear blocking ring assemblies (1, 2, and 3).
  11. Remove the 3rd gear bearing assembly (4).
    12. Fig 8: Coiled Spring Pin
    GM4142469Courtesy of GENERAL MOTORS COMPANY
  12. Using a 3/16 in drift and hammer, drive the coiled spring pin downward and remove.
    13. Fig 9: 3rd & 4th Synchronizer Sleeve And Fork Assembly, 3rd Gear Bearing Roller Spacer And Retaining Ring
    GM4142489Courtesy of GENERAL MOTORS COMPANY
  13. Remove the 3rd & 4th synchronizer sleeve and fork assembly (1).
  14. Remove the 3rd gear bearing roller spacer (2). Using snap ring pliers remove the retaining ring (3).
    15. Fig 10: 3rd & 4th Hub, 4th Gear Blocking Rings, 4th Gear Drive Gear And Bearing Assembly
    GM4142492Courtesy of GENERAL MOTORS COMPANY
  15. Remove the 3rd & 4th hub, 4th gear blocking rings, and 4th gear drive gear (1) as an assembly.
  16. Remove the 4th gear bearing assembly (2).
    17. Fig 11: Shift Shaft Detent Plug
    GM4142494Courtesy of GENERAL MOTORS COMPANY
  17. Remove the shift shaft detent plug (1). Then using a 3/16 in drift and hammer drive the coiled spring pin downward and remove.
    18. Fig 12: Shift Shaft Detent Spring, Cover Bolt And Detent
    GM4142497Courtesy of GENERAL MOTORS COMPANY
  18. With the same drift still in the shift shaft, remove the shift shaft detent spring cover bolt (1), shift shaft detent spring (2), and shift shaft detent (3).
    19. Fig 13: Shift Shaft Detent Spring, Cover Bolt And Detent
    GM4142501Courtesy of GENERAL MOTORS COMPANY
  19. Using a 3/16 in punch drive the coiled spring pin downward and remove.
  20. With the drift still in the shift shaft, remove the shift shaft detent spring cover bolt (1), shift shaft detent spring (2), and shift shaft detent (3).
    21. Fig 14: 3rd And 4th Shift Shaft
    GM4562693Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Watch for interlock pin inside of this shaft, keep parts together.

  21. Remove the 3rd & 4th shift shaft (1).
    22. Fig 15: Shift Shaft Detent Spring Cover Bolts, Springs And Detents
    GM4142508Courtesy of GENERAL MOTORS COMPANY
  22. Remove the shift shaft detent spring cover bolt (1 and 6), shift shaft detent springs (2 and 5) and shift shaft detents (3 and 4).
  23. Using a 3/16 in punch drive the coiled spring pin downward and remove.
    24. Fig 16: Selector Levers
    GM4142511Courtesy of GENERAL MOTORS COMPANY
  24. Remove the manual transmission 3rd & 4th selector lever (1), manual transmission 5th & 6th selector lever (2), and the manual transmission 1st & 2nd selector lever (3).
    25. Fig 17: Reverse Shift Shaft Assembly And Manual Transmission Reverse Selector Lever
    GM4142514Courtesy of GENERAL MOTORS COMPANY
  25. Remove the reverse shift shaft assembly and manual transmission reverse selector lever (1) as an assembly.
    26. Fig 18: Roll Pins, Shift Interlock Plate Retainer Bolts, Shift Control Spacer And Neutral Cam
    GM4562697Courtesy of GENERAL MOTORS COMPANY
  26. Using a drift punch and hammer drive the roll pins (6) downward and remove.
  27. Remove the shift interlock plate retainer bolts (1), shift control spacer (4), and neutral cam (5).
  28. Remove the shift bar support (interlock) (2) and selector finger and cam (7) at the same time, then remove the shift interlock pins (3).
  29. Remove the second shift control spacer (8)
    30. Fig 19: 4th Gear Assembly & Special Tools
    GM2776911Courtesy of GENERAL MOTORS COMPANY
  30. Remove the 4th gear assembly (1) using J 22888-D  side bearing remover (2) with DT 51075  puller adapter set (3).
    31. Fig 20: Clutch Housing Bolts
    GM2776826Courtesy of GENERAL MOTORS COMPANY
  31. Remove the clutch housing bolts (1).
    32. Fig 21: Transmission Case Assembly
    GM2776918Courtesy of GENERAL MOTORS COMPANY
  32. Remove the transmission case assembly (1).
    33. Fig 22: Shift Shaft Assemblies
    GM2779184Courtesy of GENERAL MOTORS COMPANY
  33. Remove the Shift Shaft Assemblies (1 & 2).
    34. Fig 23: Counter Gear Assembly
    GM2776919Courtesy of GENERAL MOTORS COMPANY
  34. Remove the counter gear assembly (1).
    35. Fig 24: Input Shaft Assembly & Related Components
    GM2776922Courtesy of GENERAL MOTORS COMPANY
  35. Remove the main shaft, shift rails, and shift forks as an assembly (1).
  36. Remove the blocking ring (2), intermediate cone (3), and inner cone (4).
  37. Remove the input shaft assembly (5).
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