GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 21426 Extension Housing Seal Installer

Removal Procedure

    Caution: Refer to Safety Glasses Caution in the Preface section.

    Caution: Refer to Vehicle Lifting Caution in the Preface section.

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle .

  2. Object Number: 656358  Size: SH
  3. Remove the catalytic converter support bracket.
  4. Remove the catalytic converter from the vehicle. Refer to Catalytic Converter Replacement - Left Side and Catalytic Converter Replacement - Right Side .
  5. remove the transmission mount from the vehicle. Refer to Transmission Mount Replacement .
  6. Remove the propeller shaft. Refer to Propeller Shaft Replacement .
  7. Remove the transmission extension housing bolts (1).
  8. Remove the transmission extension housing (2).
  9. Remove the transmission extension housing O ring (3). Discard the O ring (3).

  10. Object Number: 481935  Size: SH
  11. Remove the output shaft sleeve (1), if necessary.
  12. Remove the output shaft seal (2), if necessary.

Installation Procedure


    Object Number: 481935  Size: SH
  1. Install the output shaft sleeve seal (2), if necessary.
  2. Install the output shaft sleeve (1) using J 21426 , if necessary.

  3. Object Number: 647512  Size: SH
  4. Install a new transmission extension housing seal using a soft face hammer and J 21426 .

  5. Object Number: 656358  Size: SH
  6. Install a new transmission extension housing O ring (3).
  7. Notice: Refer to Fastener Notice in the Preface section.

  8. Install the case extension (2).
  9. Install the case extension bolts (1).
  10. Tighten
    Tighten the case extension bolts (1) to 45 N·m (33 lb ft).

  11. Install the propeller shaft. Refer to Propeller Shaft Replacement .
  12. Install the catalytic converter from the vehicle. Refer to Catalytic Converter Replacement - Left Side and Catalytic Converter Replacement - Right Side ..
  13. Install the catalytic converter support bracket.
  14. Lower the vehicle.
  15. Check the transmission fluid level.