GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 21426 Extension Housing Seal Installer
    • J 36850 Transjel Lubricant

Removal Procedure


    Object Number: 408509  Size: SH
  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Place a drain pan under the vehicle.
  3. Remove the propeller shaft. Refer to One-Piece Propeller Shaft Replacement or Two-Piece Propeller Shaft Replacement .
  4. Remove the case extension housing rear oil seal. Use a flat-bladed tool and carefully pry the seal from the housing.
  5. Inspect the case extension housing for damage. Replace the extension housing if necessary. Refer to Case Extension Assembly Replacement .

Installation Procedure


    Object Number: 647512  Size: SH
  1. Lubricate the inside diameter of the new seal with J 36850 .
  2. Use the J 21426 with a soft faced mallet to install the seal.
  3. Install the seal to the extension housing.
  4. Install the propeller shaft. Refer to One-Piece Propeller Shaft Replacement or Two-Piece Propeller Shaft Replacement .
  5. Remove the drain pan and lower the vehicle.
  6. Fill the transmission to the proper level with DEXRON® VI transmission fluid. Refer to Transmission Fluid Check .