GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 21426 Rear Extension Seal Installer

Removal Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the propeller shaft. Refer to Rear Propeller Shaft Replacement in Driveline/Axle.

  3. Object Number: 408509  Size: SH
  4. Remove the rear extension oil seal.

Installation Procedure


    Object Number: 647512  Size: SH
  1. Install the new seal usingJ 21426 and a soft faced mallet.
  2. Install the propeller shaft.
  3. Lower the vehicle.
  4. Check the transmission fluid level.
  5. Use Dexron® III Automatic Transmission Fluid.