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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 Assemble (M3L) >> Shift Shaft Assemblies and Gear Cluster Install

Shift Shaft Assemblies and Gear Cluster Install

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: Input Shaft, Thrust Bearing And Washer
    GM4563292Courtesy of GENERAL MOTORS COMPANY
  1. Install the input shaft (7).
  2. Install the thrust bearing (6) and washer (5).
    3. NOTE:

    Ensure the 5th gear blocking rings (2, 3, 4) are aligned into the groove of the gear on the input shaft (7).

  3. Install the 5th gear blocking ring assembly (2, 3, 4).
  4. Install the main shaft, shift shafts, and shift forks as an assembly (1).
    5. Fig 2: Counter Gear Assembly
    GM2776919Courtesy of GENERAL MOTORS COMPANY
  5. Install the counter gear assembly (1).
    6. Fig 3: Shift Shaft Assemblies
    GM2779184Courtesy of GENERAL MOTORS COMPANY
  6. Install the Shift Shaft Assemblies (1 & 2).
    7. Fig 4: Transmission Case Assembly
    GM2776918Courtesy of GENERAL MOTORS COMPANY
  7. Install the transmission case (1).
    8. Fig 5: Clutch Housing Bolts
    GM2776826Courtesy of GENERAL MOTORS COMPANY
  8. Install the clutch housing bolts (1) temporarily.
    9. Fig 6: Interlock Pins
    GM4563287Courtesy of GENERAL MOTORS COMPANY
  9. Install the interlock pins (1) into their groove in the case. Install the interlock pin (2) into the shift shaft where it meets the case.
    10. Fig 7: 4th Gear Assembly & Installer
    GM2828101Courtesy of GENERAL MOTORS COMPANY
  10. Install the 4th gear assembly (1) using the DT-51076  bearing and gear installer (2).
    11. Fig 8: 3rd And 4th Shift Shaft
    GM4562693Courtesy of GENERAL MOTORS COMPANY
  11. Install the 3rd and 4th shift shaft (1). Ensure the interlock pin is installed in the shift shaft after shaft installation.
    12. Fig 9: Shift Shaft Detent, Spring And Cover Bolt
    GM4563281Courtesy of GENERAL MOTORS COMPANY
  12. Install the shift shaft detent (3) and the shift shaft detent spring (2).
  13. Apply thread sealant to the detent spring cover bolt (1). Refer to Adhesives, Fluids, Lubricants, and Sealers (M3L) 
  14. Tighten the detent spring cover bolt (1) to 28 N.m (21 lb ft).
    15. Fig 10: Shift Control Spacer And Shift Interlock Components
    GM4142443Courtesy of GENERAL MOTORS COMPANY
  15. Install the shift control spacer (6)
  16. Install the shift bar support (interlock) (2) and selector finger and cam (5) at the same time.
  17. Install the shift interlock plate retainer bolts (1), shift control spacer (3), and neutral cam (4). Tighten the shift interlock plate retainer bolts to 31 N.m (23 lb ft).
  18. Using a 3/16 in drift punch and hammer drive the coiled spring pins downward and Install.
    19. Fig 11: Reverse Shift Shaft Assembly And Manual Transmission Reverse Selector Lever
    GM4142514Courtesy of GENERAL MOTORS COMPANY
  19. Install the reverse shift shaft assembly and manual transmission reverse selector lever (1) as an assembly.
    20. Fig 12: Selector Levers
    GM4142511Courtesy of GENERAL MOTORS COMPANY
  20. Install the manual transmission 3rd & 4th selector lever (1), manual transmission 5th & 6th selector lever (2), and the manual transmission 1st & 2nd selector lever (3).
    21. Fig 13: Coiled Spring Pin
    GM4563283Courtesy of GENERAL MOTORS COMPANY
  21. Using a 3/16 in drift punch and hammer drive the coiled spring pin (1) downward and Install.
    22. Fig 14: Shift Shaft Detent Spring Cover Bolts, Springs And Detents
    GM4142508Courtesy of GENERAL MOTORS COMPANY
  22. Install 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. Apply thread sealant to the detent spring cover bolt (1 and 6). Refer to Adhesives, Fluids, Lubricants, and Sealers (M3L) 

    Tighten plugs to 28 N.m (21 lb ft).

  24. Using a 3/16 in drift punch and hammer drive the coiled spring pin downward and Install.
    25. Fig 15: Shift Shaft Detent Spring, Cover Bolt And Detent
    GM4142497Courtesy of GENERAL MOTORS COMPANY
  25. With the same drift in the shift rail, Install the shift shaft detent spring cover bolt (1), shift shaft detent spring (2), and shift shaft detent (3).
  26. Apply thread sealant to the detent spring cover bolt (1). Refer to Adhesives, Fluids, Lubricants, and Sealers (M3L) 
  27. Tighten shift shaft detent spring cover bolt to 28 N.m (21 lb ft).
    28. Fig 16: Shift Shaft Detent Plug
    GM4142494Courtesy of GENERAL MOTORS COMPANY
  28. Using a 3/16 in drift punch and hammer drive the coiled spring pin downward and Install.
  29. Apply thread sealant to the detent spring cover bolt (1). Refer to Adhesives, Fluids, Lubricants, and Sealers (M3L) 
  30. Tighten shift shaft detent spring cover bolt to 28 N.m (21 lb ft).
    31. Fig 17: 3rd & 4th Hub, 4th Gear Blocking Rings, 4th Gear Drive Gear And Bearing Assembly
    GM4142492Courtesy of GENERAL MOTORS COMPANY
  31. Install the 4th gear bearing assembly (2).
  32. Install the 3rd & 4th hub, 4th gear blocking rings, and 4th gear drive gear (1) as an assembly.
    33. Fig 18: 3rd & 4th Synchronizer Sleeve And Fork Assembly, 3rd Gear Bearing Roller Spacer And Retaining Ring
    GM4142489Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    The retaining ring must be installed as shown in graphic, with the points facing up.

  33. Using snap ring pliers Install the retaining ring (3). Install the 3rd gear spacer (2).
  34. Install the 3rd & 4th synchronizer sleeve and fork assembly (1).
    35. Fig 19: Coiled Spring Pin
    GM4142469Courtesy of GENERAL MOTORS COMPANY
  35. Using a 3/16 in drift and hammer, drive the coiled spring pin downward and Install.
    36. Fig 20: 3rd Gear Blocking Ring Assemblies And Bearing Assembly
    GM4142465Courtesy of GENERAL MOTORS COMPANY
  36. Install the 3rd gear bearing assembly (4).
  37. Install the 3rd gear blocking ring assembly (1, 2, and 3).
    38. Fig 21: 3rd Gear Thrust Washer And Drive Gear Assembly
    GM4142463Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Thrust washer (1) must be installed with lip facing upwards as shown in picture.

  38. Install the 3rd gear drive gear assembly (2) and the 3rd gear thrust washer (1).
    39. Fig 22: Reverse Drive Gear Assembly
    GM4142516Courtesy of GENERAL MOTORS COMPANY
  39. Install the reverse drive gear assembly (4) using DT 25234  gear and bearing installer.
  40. Using snap ring pliers install the reverse drive gear assembly retainer (3).
    41. NOTE:

    Replacement bearings will be shipped as an assembly and only the race is installed at this point.

  41. Install the counter gear rear bearing race (2) and snap ring (1).
    42. Fig 23: 3rd Gear And 3rd & 4th Gear Spacer
    GM4142520Courtesy of GENERAL MOTORS COMPANY
  42. Install the 3rd gear assembly (1) and the 3rd & 4th gear spacer (2) using DT-51076  bearing and gear installer.
    43. Fig 24: Reverse Gear Bearing Assembly And Bushing
    GM4142454Courtesy of GENERAL MOTORS COMPANY
  43. Install the reverse gear bearing assembly (1) and bushing (2).
    44. Fig 25: Reverse Gear And Synchronizer
    GM4563289Courtesy of GENERAL MOTORS COMPANY
    NOTE:

    Ensure Blocking rings and gear gap align just like the input shaft blocking rings as shown by arrow.

  44. Install the reverse gear and synchronizer (5) together as an assembly, then install the reverse clutch gear (4). Using a suitable press tube and a rubber mallet, install the reverse gear and synchronizer assembly (5) and the reverse clutch gear (4) until fully seated.
    45. NOTE:

    Replacement bearings will be shipped as an assembly and only the race is installed at this point.

  45. Install the spacer (1), main shaft rear bearing race (2), and the main shaft bearing spacer (3).
    46. Fig 26: Coiled Spring Pin
    GM4142448Courtesy of GENERAL MOTORS COMPANY
  46. Using a 3/16 in drift punch and hammer drive the coiled spring pin downward and Install.
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