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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 (M3L) >> Input Shaft, Main Shaft, and Counter Gear

Input Shaft, Main Shaft, and Counter Gear

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 6th gear blocking ring to the input shaft.
    3. The main shaft assembly (2)
    4. The counter gear (1), lifting up the main shaft enough to install the counter gear.
    3. Fig 2: Transmission Case
    GM2776795Courtesy of GENERAL MOTORS COMPANY
  3. Install the transmission case (1).
    4. Fig 3: Clutch Housing To Transmission Case Bolts
    GM2776797Courtesy of GENERAL MOTORS COMPANY
    CAUTION:

    Refer to Fastener Caution .

  4. Install the clutch housing to transmission case bolts (1) and tighten to 33 N.m (27 lb ft).
    5. Fig 4: Measuring Input Shaft/Mainshaft End Play
    GM2102311Courtesy of GENERAL MOTORS COMPANY
  5. Measure the input shaft/main shaft end play using the following procedure:
    1. Place the tip of the J 8001  indicator set (1) on the end of the main shaft.
    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 counter gear end play using the following procedure:
    1. Place the tip of the J 8001  indicator set (1) on the end of the counter gear.
    2. Move the counter gear 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: Clutch Housing To Transmission Case Bolts
    GM2776797Courtesy of GENERAL MOTORS COMPANY
  11. Remove the clutch housing to the transmission case bolts (1).
    12. Fig 7: Transmission Case
    GM2776795Courtesy of GENERAL MOTORS COMPANY
  12. Remove the transmission case (1).
    13. Fig 8: Input Shaft, Mainshaft, and Countershaft
    GM2102308Courtesy of GENERAL MOTORS COMPANY
  13. Remove the following parts in order:
    1. The counter gear (1), lifting up the main shaft (2) enough to remove the counter gear.
    2. The main shaft assembly (2)
    3. The input shaft (3)
    14. Fig 9: Input Shaft Bearing Race & Shim
    GM2102316Courtesy of GENERAL MOTORS COMPANY
  14. Remove the input shaft bearing race (1).
  15. Remove the input shaft bearing shim (2) and discard.
  16. Install the NEW input shaft bearing shim, and the original bearing race.
    17. Fig 10: Countershaft Bearing Race & Shim
    GM2102317Courtesy of GENERAL MOTORS COMPANY
  17. Remove the counter gear front bearing race (1).
  18. Remove the counter gear front bearing shim (2) and discard.
  19. Install the NEW counter gear front bearing shim, and the original bearing race.
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