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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 2500 or 3500 With 6.0L) >> Removal Procedure

Removal 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 Axle Vent Hose (8.6 or 9.5 Inch Ring Gear)
    GM692548Courtesy of GENERAL MOTORS CORP.
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Remove the spare tire, if necessary.
  3. Install adjustable jack stands under the rear axle, if necessary.
  4. If equipped with a 8.6 or a 9.5 inch ring gear, remove the rear axle vent hose from the rear axle, if necessary.
  5. Remove the vent hose swivel clip from the rear brake crossover pipe, if necessary.
    6. Fig 2: View Of Rear Axle Vent Hose (10.5 Inch Ring Gear)
    GM695038Courtesy of GENERAL MOTORS CORP.
  6. If equipped with a 10.5 inch ring gear, remove the rear axle vent hose from the rear axle, if necessary.
  7. Remove the vent hose swivel clip from the rear brake crossover pipe, if necessary.
    8. Fig 3: Identifying Rear Shock Absorbers Lower Bolts & Nuts
    GM665315Courtesy of GENERAL MOTORS CORP.
  8. Remove the rear shock absorber lower bolts and nuts, if necessary.
  9. Lower the rear axle using the adjustable jack stands, if necessary.
    10. Fig 4: View Of Catalytic Converter To Muffler Nuts (RPO L92)
    GM1708979Courtesy of GENERAL MOTORS CORP.
  10. Remove the muffler to catalytic converter nuts.
    11. Fig 5: View Of Muffler Assembly Insulators
    GM1856703Courtesy of GENERAL MOTORS CORP.
  11. If the vehicle is a non heavy duty (HD), perform the following steps, otherwise proceed to step 14:
  12. Lubricate the 4 insulators where the muffler assembly hangers are inserted in order to ease removal.
  13. With the aid of an assistant, remove the insulators (1-4) from the front, intermediate, and rear muffler assembly hangers and remove the muffler assembly.
    14. Fig 6: Identifying Muffler Assembly Insulators
    GM1856702Courtesy of GENERAL MOTORS CORP.
  14. If the vehicle is a heavy duty (HD) perform the following steps:
  15. Lubricate the 3 insulators where the muffler assembly hangers are inserted in order to ease removal.
  16. With the aid of an assistant, remove the insulators (1-3) from the front, intermediate, and rear muffler assembly hangers and remove the muffler assembly.
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