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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 >> Shimming Procedures (MG9) >> Input Shaft, Mainshaft, and Countershaft

Input Shaft, Mainshaft, and Countershaft

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, Mainshaft, and Countershaft
    GM2102308Courtesy of GENERAL MOTORS COMPANY
  1. Rotate the clutch housing to the vertical position.
  2. Install the following assemblies in order:
    1. The input shaft (3)
    2. Align the 4th speed gear blocking ring to the input shaft.
    3. The mainshaft assembly (2)
    4. The countershaft (1), lifting up the mainshaft enough to install the countershaft.
    3. Fig 2: Transmission Case
    GM2102309Courtesy of GENERAL MOTORS COMPANY
  3. Install the transmission case (1).
    4. Fig 3: Clutch Housing To Transmission Case Bolts
    GM2102310Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

  4. Install the clutch housing to transmission case bolts (1) and tighten to 36 N.m (27 lb ft).
    5. Fig 4: Measuring Input Shaft/Mainshaft End Play
    GM2102311Courtesy of GENERAL MOTORS COMPANY
  5. Measure the input shaft/mainshaft end play using the following procedure:
    1. Place the tip of the J 8001  indicator set (1) on the end of the mainshaft.
    2. Move the main shaft up and down.
    3. Record the measurement.
  6. Select a shim to achieve 0.0127-0.0889 mm (0.00049-0.00349 in) end play.
  7. Remove the J 8001  indicator set.
    8. Fig 5: Measuring Countershaft End Play
    GM2102312Courtesy of GENERAL MOTORS COMPANY
  8. Measure the countershaft end play using the following procedure:
    1. Place the tip of the J 8001  indicator set (1) on the end of the countershaft.
    2. Move the countershaft up and down.
    3. Record the measurement.
  9. Select a shim to achieve 0.0127-0.0889 mm (0.00049-0.00349 in) end play.
  10. Remove the J 8001  indicator set.
    11. Fig 6: Shift Lever Guide Bolts
    GM2102314Courtesy of GENERAL MOTORS COMPANY
  11. Remove the shift lever guide bolts (1).
    12. Fig 7: Clutch Housing To Transmission Case Bolts
    GM2102310Courtesy of GENERAL MOTORS COMPANY
  12. Remove the clutch housing to the transmission case bolts (1).
    13. Fig 8: Transmission Case
    GM2102309Courtesy of GENERAL MOTORS COMPANY
  13. Remove the transmission case (1).
    14. Fig 9: Input Shaft, Mainshaft, and Countershaft
    GM2102308Courtesy of GENERAL MOTORS COMPANY
  14. Remove the following parts in order:
    1. The countershaft (1), lifting up the mainshaft (2) enough to remove the countershaft.
    2. The mainshaft assembly (2)
    3. The input shaft (3)
    15. Fig 10: Input Shaft Bearing Race & Shim
    GM2102316Courtesy of GENERAL MOTORS COMPANY
  15. Remove the input shaft bearing race (1).
  16. Remove the input shaft bearing shim (2) and discard.
  17. Install the new input shaft bearing shim, and the original bearing race.
    18. Fig 11: Countershaft Bearing Race & Shim
    GM2102317Courtesy of GENERAL MOTORS COMPANY
  18. Remove the countershaft bearing race (1).
  19. Remove the countershaft bearing shim (2) and discard.
  20. Install the new input shaft bearing shim, and the original bearing race.
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