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Home >> Chevrolet >> 2012 >> Tahoe Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1101 (Automatic Transmission - 6L50/6L80/6L90 - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Repair Instructions - On Vehicle >> Transmission Replacement (Rear Wheel Drive) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the exhaust system. Refer to Exhaust System Replacement (With LY7 and LLT) or Exhaust System Replacement (With LP1) .
  2. Remove the catalytic converters. Refer to Catalytic Converter Replacement - Left Side and Catalytic Converter Replacement - Right Side .
  3. Remove the propeller shaft. Refer to Rear Propeller Shaft Replacement (RWD) or Rear Propeller Shaft Replacement (AWD) .
    4. Fig 1: View Of Manual Shift Shaft Nut
    GM1841192Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the shift linkage from the transmission.
    5. Fig 2: View Of Transmission Vent Hose
    GM1983368Courtesy of GENERAL MOTORS CORP.
  5. Remove the transmission vent hose from the retaining clips (6) on the transmission support.
    6. Fig 3: Identifying Transmission Wiring Harness Connector
    GM1979767Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the transmission wiring harness connector (4) from the transmission by releasing the locking mechanism and rotating the latch counterclockwise.
  7. Remove the wiring harness retainers (1) from the transmission.
  8. Remove the oxygen sensor wiring harness connector (2) from the transmission.
  9. Place an oil drain pan under the transmission fluid cooler pipes.
    10. Fig 4: Identifying Transmission Fluid Cooler Pipes
    GM1979765Courtesy of GENERAL MOTORS CORP.
  10. Remove the transmission fluid cooler pipes (1) from the transmission, and position aside. Refer to Transmission Fluid Cooler Pipe Replacement - Rear .
  11. Remove and discard the O-rings. Do NOT reuse the O-rings.
  12. Plug the open outlet ports to prevent fluid loss and contamination.
    13. Fig 5: Identifying Transmission Close Out Plug
    GM1983699Courtesy of GENERAL MOTORS CORP.
  13. Remove the transmission close out plug (1).
  14. Mark the torque converter to flexplate/flywheel orientation to ensure proper realignment.
  15. Remove the starter motor. Refer to Starter Motor Replacement (LY7) .
    16. Fig 6: Identifying Torque Converter Bolts
    GM1979764Courtesy of GENERAL MOTORS CORP.
  16. Repeat the following steps for all torque converter bolts (1):
    1. Rotate the harmonic balancer center bolt clockwise ONLY, in order to align the torque converter bolt with the access hole.
    2. Remove and discard the torque converter bolt.
  17. Support the transmission with a suitable transmission jack.
  18. Remove the transmission support. Refer to Transmission Support Replacement (Manual Transmission) or Transmission Support Replacement (Automatic Transmission) .
  19. Lower the transmission.
    20. Fig 7: Identifying Transmission Vent Hose
    GM1983368Courtesy of GENERAL MOTORS CORP.
  20. Disconnect the transmission vent hose (4) from the transmission vent pipe (1).
    21. Fig 8: Wiring Harness Retainers
    GM1979766Courtesy of GENERAL MOTORS CORP.
  21. Remove the wiring harness retainers (2) from the transmission.
  22. Position the transmission wiring harness (1) and vent tube out of the way.
    23. Fig 9: Transmission Mounting Bolts
    GM1979763Courtesy of GENERAL MOTORS CORP.
  23. Remove the transmission mounting bolts (1-6).
  24. Pull the transmission free from the engine dowels.
    25. IMPORTANT: Ensure clearance is maintained between the transmission and the following:
    • The wiring harness
    • The vent tube
    • The cooler pipes
  25. Carefully lower the transmission from the vehicle.
  26. Flush the transmission oil cooler if necessary. Refer to Transmission Fluid Cooler Flushing and Flow Test (J 45096) .
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