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. Place a drain pan under the vehicle.
  2. Remove the propeller shaft. Refer to Rear Propeller Shaft Replacement in Propeller Shaft.
  3. Remove the case extension housing rear oil seal. Use a flat bladed tool and carefully pry the seal from the housing.
  4. 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. Using J 21426 and a soft faced mallet, install the seal.
  3. Remove the drain pan.
  4. Install the propeller shaft. Refer to Rear Propeller Shaft Replacement in Propeller Shaft.
  5. Fill the transmission to the proper level with DEXRON® III transmission fluid. Refer to Transmission Fluid Check .