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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 921 (Engine Exhaust System) >> Repair Instructions >> Muffler Replacement (2500/3500 - Cab/Chassis w/6.0L) >> Installation Procedure

Installation 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 Muffler Assembly Insulators
    GM1856704Courtesy of GENERAL MOTORS CORP.
  1. Lubricate the 4 insulators where the muffler assembly hangers are inserted in order to ease installation.
  2. With the aid of an assistant, position and install the muffler assembly.
  3. Install the insulators (1-4) to the front, intermediate, and rear muffler assembly hangers.
    4. Fig 2: View Of Exhaust Muffler, Exhaust Manifold Pipe, Gasket & Nuts
    GM1856230Courtesy of GENERAL MOTORS CORP.
  4. Install the 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) .
    5. NOTE: Refer to Fastener Notice .
  5. Tighten the exhaust muffler clamp (3).

    Tighten:  Tighten the nuts to 47 N.m (35 lb ft).

  6. Install the exhaust muffler to exhaust manifold pipe nuts (1).

    Tighten:  Tighten the nuts to 45 N.m (33 lb ft).

    7. Fig 3: Rear Shock Absorber Bolts & Nuts (6.0L, 6.6L, and 8.1L Engines)
    GM665315Courtesy of GENERAL MOTORS CORP.
  7. Raise the rear axle using the adjustable jack stands, if necessary.
  8. Install the rear shock absorber lower bolts and nuts, if necessary.

    Tighten:  Tighten the bolts to 95 N.m (70 lb ft).

    9. Fig 4: Rear Axle Vent Hose (10.5 Inch Ring Gear)
    GM695038Courtesy of GENERAL MOTORS CORP.
  9. If equipped with a 10.5 inch ring gear, install the rear axle vent hose to the rear axle, if necessary.
  10. Connect the vent hose swivel clip to the rear brake crossover pipe, if necessary.
    11. Fig 5: Rear Axle Vent Hose (8.6 or 9.5 Inch Ring Gear)
    GM692548Courtesy of GENERAL MOTORS CORP.
  11. If equipped with a 8.6 or a 9.5 inch ring gear, install the rear axle vent hose to the rear axle, if necessary.
  12. Install the vent hose swivel clip to the rear brake crossover pipe, if necessary.
  13. Remove the adjustable jack stands from under the rear axle, if necessary.
  14. Install the spare tire, if necessary.
  15. Lower the vehicle.
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