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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 (MG9) >> Reverse Speed Gear Installation

Reverse Speed Gear Installation

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: Reverse Gear Components
    GM2102205Courtesy of GENERAL MOTORS COMPANY
  1. Install the following parts in order:
    1. The reverse gear blocking ring assembly (5), including the following components:
      • Reverse gear inner ring (6)
      • Reverse gear outer ring (7)
      • Reverse gear blocking ring (8)
    2. The caged needle bearing (4)
    3. The reverse speed gear (3)
    4. The thrust washer (2)
    5. The retainer ring (1)
    2. Fig 2: Rear Bearing Retainer Ring, Spacers And Mainshaft Rear Roller Bearing
    GM2102203Courtesy of GENERAL MOTORS COMPANY
  2. Install the following parts in order:
    1. The spacer (3)
      2. NOTE:

      Replacement bearings will be shipped as assembly and only the roller bearing section is installed at this point. The Race is installed in the extension housing.

    2. The roller bearing (2)
    3. The spacer (3)
    4. The roller bearing retainer ring (1)
    3. Fig 3: Snap Ring, Speed Sensor Rotor And Locking Ball
    GM2102202Courtesy of GENERAL MOTORS COMPANY
  3. Install the following parts in order:
    • The locking ball (3)
    • The speed sensor rotor (2)
    • The snap ring (1)
    4. Fig 4: Shift Guide Rollpin, Shift Shaft Extension And Extension Housing Main Shaft Bearing Race
    GM2102200Courtesy of GENERAL MOTORS COMPANY
  4. Install the extension housing main shaft bearing race (3).
  5. Install the shift shaft extension (2).
  6. Install NEW shift guide roll pin (1).
    7. Fig 5: Plug, Spring & Shift Detent Roller
    GM2102199Courtesy of GENERAL MOTORS COMPANY
  7. Lift up on the shift shaft extension while installing the shift detent roller (3), spring (2) and plug (1). Tighten the shift shaft detent plug to 50 N.m (37 lb ft).
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