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Removal Procedure

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    Fig 1: View of Oil Pan Skid Plate
    GM339429Courtesy of GENERAL MOTORS CORP.
  1. Remove the rear tires and wheels. Refer to TIRE AND WHEEL REMOVAL AND INSTALLATION .
  2. Remove the oil pan skid plate bolts and plate, if necessary.
  3. Remove the spare tire.
    4. Fig 2: Identifying Electronic Suspension Rear Position Sensor & Rear Shock
    GM665311Courtesy of GENERAL MOTORS CORP.
  4. If servicing a vehicle with regular production option (RPO) Z55, disconnect the chassis harness from the following electrical connectors:
    • Electronic suspension rear position sensor (1)
    • Rear shock (2)
    5. IMPORTANT: Do not attempt to pry the rear suspension sensor link rods from the rear position sensor ball studs.
  5. Remove the left and right sensor link rods from the sensors, perform the following:
    1. Support the sensor lever with your hand
    2. Twist the link rod in order to remove it from the ball stud
  6. Install adjustable jack stands under the rear axle.
    7. Fig 3: View of Rear Axle Vent Hose
    GM692548Courtesy of GENERAL MOTORS CORP.
  7. If equipped with a 8.6 or 9.5 inch ring gear, remove the rear axle vent hose from the rear axle, if necessary.
  8. Remove the vent hose swivel clip from the rear brake crossover pipe.
    9. Fig 4: View of Rear Axle Vent Hose
    GM695038Courtesy of GENERAL MOTORS CORP.
  9. If equipped with a 10.5 inch ring gear, remove the rear axle vent hose from the rear axle, if necessary.
  10. Remove the vent hose swivel clip from the rear brake crossover pipe.
    11. Fig 5: Identifying Rear Shock Absorbers
    GM665315Courtesy of GENERAL MOTORS CORP.
  11. Remove the rear shock absorbers lower bolts and nuts.
  12. Lower the rear axle slightly, using the adjustable jack stands, in order to remove the muffler.
    13. Fig 6: View of Oxygen Sensor, Electrical Connector, & CPA Retainer
    GM693000Courtesy of GENERAL MOTORS CORP.
  13. Unclip the oxygen sensor connector from the frame.
  14. Disconnect the connector position assurance (CPA) retainer.
  15. Disconnect the oxygen sensor electrical connector.
    16. Fig 7: View of Oxygen Sensor & Electrical Connector
    GM694907Courtesy of GENERAL MOTORS CORP.
  16. If equipped with a 6.0L engine, perform the following:
    • Unclip the oxygen sensor connector from the frame.
    • Disconnect the CPA retainer.
    • Disconnect the oxygen sensor electrical connector.
    17. Fig 8: Identifying Exhaust Muffler Nuts
    GM665520Courtesy of GENERAL MOTORS CORP.
  17. Remove the exhaust muffler nuts.
  18. Loosen the exhaust pipe clamp.
  19. With the aid of an assistant, support the exhaust muffler.
    20. Fig 9: View of Muffler
    GM665522Courtesy of GENERAL MOTORS CORP.
  20. Remove the insulators from the frame hangers.
  21. With the aid of an assistant, slide the muffler rearward in order to remove the muffler from the catalytic converter.
  22. Remove the insulators from the muffler hangers.
  23. Remove the exhaust manifold pipe gasket.
    24. Fig 10: View of Oxygen Sensor at Muffler
    GM695550Courtesy of GENERAL MOTORS CORP.
  24. Remove the oxygen sensor if the muffler is being replaced.
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