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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 151 (Engine Exhaust System) >> Repair Instructions >> Muffler Replacement (1500 - w/RPO L92) >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Chassis Wiring Harness Electrical Connectors & Right Rear Wheel Speed Sensor Wiring Harness Electrical Connector
    GM1709051Courtesy of GENERAL MOTORS CORP.
  1. Remove the right rear wheel and tire. Refer to Tire and Wheel Removal and Installation .
  2. Disconnect the chassis wiring harness electrical connector (1) from the right rear wheel speed sensor wiring harness electrical connector (2).
  3. If the vehicle is equipped with regular production option (RPO) Z55, disconnect the chassis wiring harness electrical connector (3) from the right rear shock absorber.
  4. If the vehicle is equipped with RPO Z55, disconnect the right rear air line from the shock absorber.
  5. Remove the right rear wheel speed sensor wiring harness electrical connector clip from the frame.
    6. Fig 2: View Of Right Axle Tie Rod Bolt & Nut
    GM1709061Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: The rear axle wiring harness clip is a one way clip with a D-shape section. The clip can only be installed and/or removed in only one direction.
  6. Remove the right rear wheel speed sensor wiring harness clips from the frame and the control arm bracket.
    7. IMPORTANT: Do not attempt to pry the rear suspension sensor link rod from the rear position sensor ball stud.
  7. Disconnect the right rear automatic level control sensor link rod from the sensor. Perform the following:
    1. Support the sensor lever with your hand.
    2. Twist the link rod ball in order to separate it from the ball stud.
  8. Install a suitable adjustable jack under the rear axle.
  9. Remove the right axle tie rod bolt (2) and nut (1).
    10. Fig 3: Rear Axle Vent Hose (8.6 or 9.5 Inch Ring Gear)
    GM692548Courtesy of GENERAL MOTORS CORP.
  10. Remove the rear axle vent hose from the rear axle, if necessary.
  11. Remove the vent hose swivel clip from the rear brake crossover pipe, if necessary.
  12. Remove the right rear stabilizer shaft link to frame bolt and nut.
  13. Remove the right rear stabilizer shaft link from the frame.
  14. Remove the right rear shock absorber lower bolt (4) and nut (3).
  15. Lower the right side of the rear axle using the adjustable jack in order to remove the muffler.
    16. Fig 4: View Of Catalytic Converter To Muffler Nuts (RPO L92)
    GM1708979Courtesy of GENERAL MOTORS CORP.
  16. Remove the muffler to catalytic converter nuts.
  17. Separate the hanger.
    18. Fig 5: View Of Muffler Assembly Hangers, Insulators & Exhaust System Hangers
    GM1708984Courtesy of GENERAL MOTORS CORP.
  18. If the vehicle is a Yukon Denali or Escalade perform the following steps, otherwise proceed to step 26.
  19. Lubricate the insulators where the muffler assembly hangers are inserted in order to ease in removal.
  20. With the aid of an assistant, remove the insulators from the exhaust system hangers (4, and 5).
    21. Fig 6: View Of Exhaust System Hangers & Insulator
    GM1708985Courtesy of GENERAL MOTORS CORP.
  21. With the aid of an assistant, remove the insulator from the exhaust system hanger near the resonator.
  22. Remove the muffler assembly.
    23. Fig 7: View Of Exhaust System Hangers & Insulators
    GM1708986Courtesy of GENERAL MOTORS CORP.
  23. If the vehicle is a Yukon XL, Yukon Denali XL, Escalade ESV, or Escalade EXT perform the following steps.
  24. Lubricate the insulators where the muffler assembly hangers are inserted in order to ease in removal.
  25. With the aid of an assistant, remove the insulators from the exhaust system hangers (3, 4, and 5).
    26. Fig 8: View Of Exhaust System Hangers & Insulator
    GM1708987Courtesy of GENERAL MOTORS CORP.
  26. With the aid of an assistant, remove the insulator from the exhaust system hanger near the resonator.
    27. IMPORTANT: During removal, do not over extend the flex coupler as internal damage may occur.
  27. Remove the muffler assembly.
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