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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1391 (Engine Exhaust System) >> Repair Instructions >> Exhaust Muffler Replacement (With 1500, LFA,LU3 or V8 Engine ) >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Rear Muffler Assembly Insulators
    GM1856672Courtesy of GENERAL MOTORS CORP.
  1. If equipped with a 4.8L engine, perform the following steps, otherwise proceed to step 6.
  2. Lubricate the 3 insulators where the muffler assembly hangers are inserted in order to ease installation.
    3. CAUTION: During removal or installation, do not over extend the flex couple as internal damage may occur.
  3. With the aid of an assistant, position and install the muffler assembly.
  4. Install the insulators (1, 2) to the front and rear muffler assembly hangers.
    5. Fig 2: View Of Intermediate Muffler Assembly Insulator
    GM1856675Courtesy of GENERAL MOTORS CORP.
  5. Install the insulator (1) to the intermediate muffler assembly hanger.
    6. Fig 3: View Of Front & Rear Muffler Assembly Insulators
    GM1856677Courtesy of GENERAL MOTORS CORP.
  6. If equipped with a 5.3L, or a 6.0L engine, perform the following steps.
  7. Lubricate the 3 insulators where the muffler assembly hangers are inserted in order to ease installation.
  8. With the aid of an assistant, position and install the muffler assembly.
  9. Install the insulators (1, 2) to the front and rear muffler assembly hangers.
    10. Fig 4: View Of Intermediate Muffler Assembly Insulators
    GM1856679Courtesy of GENERAL MOTORS CORP.
  10. Install the insulator (1) to the intermediate muffler assembly hanger.
    11. Fig 5: View Of Catalytic Converter To Muffler Nuts
    GM1708705Courtesy of GENERAL MOTORS CORP.
    CAUTION: Refer to Fastener Caution .
  11. Install the catalytic converter to exhaust muffler nuts and tighten to 45 N.m (33 lb ft).
  12. Return the spare tire to the original position.
  13. Lower the vehicle.
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