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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1036 (Engine Exhaust System) >> Repair Instructions >> Muffler Replacement (2500/3500 - Cab/Chassis w/6.0L) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: 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: 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: Rear Shock Absorber Bolts And Nuts (6.0L, 6.6L, and 8.1L Engines)
    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 Exhaust Muffler, Exhaust Manifold Pipe, Gasket & Nuts
    GM1856230Courtesy of GENERAL MOTORS CORP.
  10. Remove the exhaust muffler to exhaust manifold pipe nuts (1).
  11. Loosen the exhaust muffler clamp (3).
  12. Remove the heated oxygen sensor (HO2S). Refer to Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (1500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series) or Heated Oxygen Sensor Replacement - Bank 2 Sensor 2 (2500 Series - Cab/Chassis) .
    13. Fig 5: View Of Muffler Assembly Insulators
    GM1856704Courtesy of GENERAL MOTORS CORP.
  13. Lubricate the 4 insulators where the muffler assembly hangers are inserted in order to ease removal.
  14. 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.
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