GM Service Manual Online
For 1990-2009 cars only

Tools Required

    • J 41239-10 Cooler Line Seal Remover.
    • J 41239-1A Cooler Line Seal Installer.

Removal Procedure

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

  1. Raise the vehicle. Support the vehicle.
  2. Remove the transmission oil cooler pipes from the transmission. Refer to Automatic Transmission Oil Cooler Pipes Replacement

  3. Object Number: 643345  Size: SH
  4. Remove the cooler pipe bracket stud.

  5. Object Number: 643333  Size: SH
  6. Remove the oil cooler pipe seals.

Installation Procedure


    Object Number: 643327  Size: SH
  1. Install the J 41239-1A on the transmission case using cooler pipe bracket stud hole.
  2. Press the new seals in. Tighten the J 41239-1A until the seal bottoms out in the case bore.

  3. Object Number: 643345  Size: SH
  4. Install the cooler pipe bracket stud.
  5. Install the transmission oil cooler pipes. Refer to Automatic Transmission Oil Cooler Pipes Replacement .
  6. Lower the vehicle.
  7. Inspect the transmission fluid level. Refer to Transmission Fluid Check .
  8. Operate the engine for 2 or 3 minutes.
  9. Inspect the transmission fluid level. Refer to Transmission Fluid Check .