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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1159 (Manual Transmission - AISIN AY6) >> Repair Instructions - On Vehicle >> Mainshaft Rear Oil Seal Replacement >> 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. Place the transmission in neutral.
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .
  3. Remove the propeller shaft. Refer to Rear Propeller Shaft Replacement (RWD) or Rear Propeller Shaft Replacement (AWD) .
  4. Using a flat-bladed tool, disengage the staked portion of the drive flange nut.
  5. Fig 1: View of DT-48636 and J 29873
    GM1921488Courtesy of GENERAL MOTORS CORP.
  6. Install the DT-48636  to the drive flange. See Special Tools .
  7. While holding DT-48636  , loosen the flange nut using J 29873  . See Special Tools .
  8. Remove the DT-48636  . See Special Tools .
  9. Fig 2: View of Case Seal, Drive Flange, Seal & Nut
    GM1979731Courtesy of GENERAL MOTORS CORP.
  10. Remove and discard the drive flange nut (4).
  11. Remove and discard the drive flange fluid seal (3).
  12. IMPORTANT: The rear output shaft rear bearing spacer must be replaced, and the bearing preload must be adjusted every time the rear drive flange is removed from the transmission.
  13. Using J 45019  , remove the drive flange (2).
  14. Using J 6125-1B  and J 23129  remove the transmission case extension seal (1). See Special Tools .
  15. Fig 3: View Of Extension Housing & Bolts
    GM1413894Courtesy of GENERAL MOTORS CORP.
  16. Remove the rear extension housing (86). Refer to Transmission Disassemble .
  17. Fig 4: View Of Vehicle Speed Sensor Drive Gear, Spacer, Locking Ball & Main Shaft Bearing Oil Slinger
    GM1413895Courtesy of GENERAL MOTORS CORP.
  18. Remove and discard the rear output shaft rear bearing spacer (191).