GM Service Manual Online
For 1990-2009 cars only

Exhaust Muffler Insulator, Hanger, and Bracket Replacement 3800 w/o RPO Y87

Removal Procedure

  1. Raise and suitably support the vehicle. Refer to Vehicle Lifting and Jacking in General Information.
  2. Support the exhaust muffler.

  3. Object Number: 107760  Size: SH
  4. Remove the exhaust pipe hanger nut.

  5. Object Number: 21696  Size: SH
  6. Remove the muffler hanger bracket bolts/screws.
  7. Remove the exhaust muffler hanger.

Installation Procedure


    Object Number: 21696  Size: SH
  1. Install the muffler hanger to the underbody.
  2. Install the exhaust muffler hanger bracket bolts/screws.
  3. Tighten
    Tighten the exhaust muffler hanger bracket bolts to 9.5 N·m (84 lb in).

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.


    Object Number: 107760  Size: SH
  4. Install the exhaust pipe hanger nut.
  5. Tighten
    Tighten the hanger nut to 20 N·m (15 lb ft).

  6. Remove the support from the exhaust muffler.
  7. Lower the vehicle.

Exhaust Muffler Insulator, Hanger, and Bracket Replacement 3800 w/ RPO Y87 And 5.7

Removal Procedure

  1. Raise and suitably support the vehicle. Refer to Vehicle Lifting and Jacking in General Information.
  2. Support the exhaust muffler.

  3. Object Number: 42670  Size: SH
  4. Remove the exhaust pipe hanger nut.

  5. Object Number: 21705  Size: SH
  6. Remove the exhaust muffler hanger bracket bolts/screws.
  7. Remove the exhaust muffler hanger.

Installation Procedure


    Object Number: 21705  Size: SH
  1. Install the exhaust muffler hanger to the underbody.
  2. Install the exhaust muffler hanger bracket bolts/screws.
  3. Tighten
    Tighten the hanger bolts to 9.5 N·m (84 lb in).

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.


    Object Number: 42670  Size: SH
  4. Install the exhaust pipe hanger nut.
  5. Tighten
    Tighten the exhaust pipe hanger nut to 20 N·m (15 lb ft).

  6. Remove the support from the exhaust muffler.
  7. Lower the vehicle.