LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Hummer >> 2007 >> H3 Automatic >> Repair and Diagnosis >> Engine Mechanical >> Engine Exhaust >> Repair Instructions >> Muffler Replacement >> Installation Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Installation Procedure

  1. Complete the following in order to install the muffler to the vehicle:
    1. With the muffler turned 90 degrees counterclockwise from the rear, carefully insert the muffler over the rear axle until the flange is near the catalytic converter.
    2. Rotate the muffler clockwise 90 degrees to the installed position.
    3. Slide the muffler forward into position, aligning the studs with the rear of the catalytic converter.
    2. Fig 1: View Of Exhaust Hanger And Exhaust Muffler Hanger Rod
    GM1560120Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not use oil base lubricants.
  2. Apply a soapy solution to the following in order to ease the installation of the hanger (2):
    • The inner diameter of the exhaust muffler hanger (2)
    • The exhaust muffler hanger rod (3)
  3. Press the exhaust muffler hanger (3) over the exhaust pipe hanger rod (1).
    4. Fig 2: Identifying Exhaust Hanger & Exhaust Muffler Hanger Rod
    GM1560118Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not use oil base lubricants.
  4. Apply a soapy solution to the following in order to ease the installation of the hanger (3):
    • The inner diameter of the exhaust muffler hanger (3)
    • The exhaust muffler hanger rod (2)
  5. Press the exhaust muffler hanger (3) over the exhaust pipe hanger rod (1).
    6. Fig 3: View Of Exhaust Hanger & Exhaust Muffler Hanger Rod
    GM1560113Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not use oil base lubricants.
  6. Apply a soapy solution to the following in order to ease the installation of the hanger (1):
    • The inner diameter of the exhaust muffler hanger (1)
    • The exhaust muffler hanger rod (3)
  7. Press the exhaust muffler hanger (1) over the exhaust pipe hanger rod (3).
    8. Fig 4: View Of Nuts Securing Muffler To Catalytic Converter
    GM1560112Courtesy of GENERAL MOTORS CORP.
    NOTE: Refer to Fastener Notice .
  8. Install the nuts securing the muffler to the catalytic converter. Tighten the muffler nuts by hand until each contacts the metal flange.

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

    9. Fig 5: View Of Rear Right Wheel Suspension Assembly
    GM1313624Courtesy of GENERAL MOTORS CORP.
  9. Remove the block of wood (5) from between the frame (4) and rear axle (6).
  10. Install the right rear leaf spring bolt (1) and nut (2).

    Tighten:  Tighten the bolt and nut to 85 N.m (63 lb ft).

  11. Install the lower shock absorber bolts (8) and nuts (9).

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

  12. Inspect the exhaust system for leaks and underbody contact.
  13. Lower the vehicle.
scientia non olet · About LEMON Manuals