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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 921 (Engine Exhaust System) >> Repair Instructions >> Muffler Replacement (6.6L) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Vent Hose Swivel Clip & Rear Brake Crossover Pipe
    GM1875701Courtesy 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. 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 Shock Absorber Bolts & Nuts (6.0L, 6.6L, and 8.1L Engines)
    GM665315Courtesy of GENERAL MOTORS CORP.
  6. Remove the rear shock absorbers lower bolts and nuts, if necessary.
  7. Lower the rear axle using the adjustable jack stands, if necessary.
    8. Fig 3: View Of Exhaust Particulate Filter Nuts
    GM1875440Courtesy of GENERAL MOTORS CORP.
  8. Remove the exhaust muffler to exhaust particulate filter nuts (1).
  9. With the aid of an assistant, support the exhaust muffler.
    10. Fig 4: View Of Exhaust Insulators
    GM1875627Courtesy of GENERAL MOTORS CORP.
  10. Remove the exhaust muffler hangers from the exhaust insulators (1).
    11. Fig 5: View Of Exhaust Muffler & Gasket
    GM1875628Courtesy of GENERAL MOTORS CORP.
  11. Remove the exhaust muffler. (2500/3500 crew cab shown, regular/extended cabs similar).
  12. Remove and discard the exhaust particulate filter to muffler gasket.
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