GM Service Manual Online
For 1990-2009 cars only

Exhaust Muffler Insulator, Hanger, and Bracket Replacement With 1500 and LMG, LY2 or LY5

Removal Procedure

Warning: Refer to Protective Goggles and Glove Warning in the Preface section.

Warning: Refer to Exhaust Service Warning in the Preface section.

Note: 

   • Service the exhaust system insulators individually in order to retain the support for the exhaust system.
   • Do not use oil base lubricants.


    Object Number: 1709438  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. Spray lubricant if necessary, onto the exhaust system insulator holes where the frame hanger and the exhaust hanger are inserted.
  3. Remove the exhaust system insulator (1 or 3), as required.
  4. If replacing the exhaust system insulator (2 or 4), remove the exhaust muffler assembly. Refer to Exhaust Muffler Replacement.
  5. Spray lubricant if necessary, onto the exhaust system insulator hole where the frame hanger is inserted.
  6. Remove the exhaust system insulator (2 or 4) from the frame hanger, as required.

Installation Procedure


    Object Number: 1709438  Size: SH
  1. Spray lubricant if necessary, onto the exhaust system insulator hole where the frame hanger will be inserted.
  2. Install the exhaust system insulator (2 or 4) to the frame hanger, as required.
  3. If the exhaust system insulator (2 or 4) was replaced, install the exhaust muffler assembly. Refer to Exhaust Muffler Replacement.
  4. Spray lubricant if necessary, onto the exhaust system insulator holes where the frame hanger and the exhaust hanger will be inserted.
  5. Install the exhaust system insulator (1 or 3), as required.
  6. Lower the vehicle.

Exhaust Muffler Insulator, Hanger, and Bracket Replacement With 1500 and LC9, LMG, LY5 or L76

Removal Procedure

Warning: Refer to Protective Goggles and Glove Warning in the Preface section.

Warning: Refer to Exhaust Service Warning in the Preface section.

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

       • Service the exhaust system insulators individually in order to retain the support for the exhaust system.
       • Do not use oil base lubricants.


    Object Number: 1709436  Size: SH

    Note: Do not use oil base lubricants.

  3. Apply a soapy solution to the following in order to ease the removal of the hanger (1):
  4. • The frame support bracket rod (2)
    • The exhaust pipe hanger rod (3)
  5. Pry the exhaust pipe hanger (1) free from the following:
  6. • The frame support bracket rod (2)
    • The exhaust pipe hanger rod (3)

Installation Procedure


    Object Number: 1709436  Size: SH

    Note: Do not use oil base lubricants.

  1. Apply a soapy solution to the following in order to ease the installation of the hanger (1):
  2. • The frame support bracket rod (2)
    • The inner diameter of the exhaust pipe hanger (1)
    • The exhaust pipe hanger rod (3)
  3. Press the exhaust pipe hanger (1) over the following:
  4. • The frame support bracket rod (2)
    • The exhaust pipe hanger rod (3)
  5. Lower the vehicle.

Exhaust Muffler Insulator, Hanger, and Bracket Replacement WithL92

Removal Procedure

Warning: Refer to Protective Goggles and Glove Warning in the Preface section.

Warning: Refer to Exhaust Service Warning in the Preface section.

Note: 

   • Service the exhaust system insulators individually in order to retain the support for the exhaust system.
   • Do not use oil base lubricants.


    Object Number: 1709439  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. Spray lubricant onto the exhaust system insulators where the insulators are installed into the frame hangers for ease of removal.
  3. Remove the exhaust pipe insulators (1 and 2).
  4. If replacing the exhaust muffler insulators also (3 and 4) , support the exhaust system with an adjustable jack to in order to retain exhaust positioning.
  5. Remove the exhaust system insulators (3 and 4) from the frame hangers.

Installation Procedure


    Object Number: 1709439  Size: SH
  1. Spray lubricant onto the frame hangers where the insulators will be installed.
  2. Install the exhaust pipe insulators (1 and 2) to the frame hangers and the exhaust pipe.
  3. Install the exhaust muffler insulators (3 and 4) to the frame hangers and the muffler pipe and remove the adjustable jack stand.
  4. Inspect for proper positioning and clearance of the exhaust system.

Exhaust Muffler Insulator, Hanger, and Bracket Replacement With 2500

Removal Procedure

Warning: Refer to Protective Goggles and Glove Warning in the Preface section.

Warning: Refer to Exhaust Service Warning in the Preface section.

Note: 

   • Service the exhaust system insulators individually in order to retain the support for the exhaust system.
   • Do not use oil base lubricants.


    Object Number: 1709441  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. Spray lubricant if necessary, onto the exhaust system insulator holes where the frame hanger and the exhaust hanger are inserted.
  3. Remove the exhaust system insulator (1), as required.
  4. If replacing the exhaust system insulator (2), remove the exhaust muffler assembly. Refer to Exhaust Muffler Replacement.
  5. Spray lubricant if necessary, onto the exhaust system insulator hole where the frame hanger is inserted.
  6. Remove the exhaust system insulator (2) from the frame hanger, as required.

Installation Procedure


    Object Number: 1709441  Size: SH
  1. Spray lubricant if necessary, onto the exhaust system insulator hole where the frame hanger will be inserted.
  2. Install the exhaust system insulator (2) to the frame hanger, as required.
  3. If the exhaust system insulator (2) was replaced, install the exhaust muffler assembly. Refer to Exhaust Muffler Replacement.
  4. Spray lubricant if necessary, onto the exhaust system insulator holes where the frame hanger and the exhaust hanger will be inserted.
  5. Install the exhaust system insulator (1), as required.
  6. Lower the vehicle.

Exhaust Muffler Insulator, Hanger, and Bracket Replacement With LFA

Removal Procedure

Warning: Refer to Protective Goggles and Glove Warning in the Preface section.

Warning: Refer to Exhaust Service Warning in the Preface section.

Note: 

   • Service the exhaust system insulators individually in order to retain the support for the exhaust system.
   • Do not use oil base lubricants.


    Object Number: 1974326  Size: SH
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
  2. Spray lubricant if necessary, onto the exhaust system insulator holes where the frame hanger and the exhaust hanger are inserted.
  3. Remove the exhaust system insulator (1, 2 or 3), or any additional insulators as required.

Installation Procedure


    Object Number: 1974326  Size: SH
  1. Spray lubricant if necessary, onto the exhaust system insulator hole where the frame hanger will be inserted.
  2. Install the exhaust system insulator (1, 2 or 3) to the frame hanger, or any additional insulators as required.
  3. Lower the vehicle.