GM Service Manual Online
For 1990-2009 cars only

Exhaust System Insulator, Hanger, Bracket Replacement Converter to Transmission

Removal Procedure

  1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Disconnect the heated oxygen sensor (HO2S) electrical connector.
  3. Remove the nuts that secure the catalytic converter pipe to the exhaust manifold.
  4. Discard the old exhaust seal. Do NOT reuse the seal.
  5. Remove the nuts that secure the catalytic converter pipe to the muffler.

  6. Object Number: 1338720  Size: SH
  7. Remove the bolt securing the exhaust hanger to the transmission mount.
  8. Remove the transmission mount.
  9. Remove the catalytic converter and exhaust hanger assembly from the vehicle.

  10. Object Number: 1338721  Size: SH
  11. Remove the exhaust hanger from the catalytic converter.

Installation Procedure


    Object Number: 1338721  Size: SH
  1. Install the exhaust hanger to the catalytic converter.
  2. Install the catalytic converter and exhaust hanger assembly to the vehicle.
  3. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 1338720  Size: SH
  4. Install the bolt securing the catalytic converter pipe hanger to the transmission mount.
  5. Tighten
    Tighten the bolt to 30 N·m (22 lb ft).

  6. Install the transmission mount.
  7. Install the catalytic converter pipe to the exhaust manifold with a NEW exhaust seal.
  8. Hand thread the nuts evenly against the exhaust flange until the pipe is secure.
  9. Tighten
    Tighten the nuts to 50 N·m (37 lb ft).

  10. Connect the HO2S electrical connector.
  11. Lower the vehicle.