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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1036 (Engine Exhaust System) >> Repair Instructions >> Catalytic Converter Replacement - Left Side (6.0L - Cab/Chassis) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Transmission Mount Nuts
    GM647997Courtesy of GENERAL MOTORS CORP.
  1. Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle .
  2. Support the transmission with a suitable transmission jack.
  3. Remove the transmission mount to transmission support nuts.
  4. Raise the transmission off of the transmission support.
    5. Fig 2: View Of Transmission Support Crossmember & Bolts
    GM1856226Courtesy of GENERAL MOTORS CORP.
  5. Remove the transmission support crossmember bolts.
  6. Remove the transmission support crossmember.
    7. Fig 3: View Of Exhaust Muffler, Exhaust Manifold Pipe, Gasket & Nuts
    GM1856230Courtesy of GENERAL MOTORS CORP.
  7. Loosen the exhaust muffler clamp (3).
  8. Separate any necessary exhaust muffler insulators so that the pipe may be separated from the muffler.
  9. Use a jack stand to support the muffler.
    10. Fig 4: View Of Front HO2S, Electrical Connector & CPA Retainer
    GM1856452Courtesy of GENERAL MOTORS CORP.
  10. Remove the connector position assurance (CPA) retainer (3) from the left front heated oxygen sensor (HO2S).
  11. Disconnect the engine wiring harness electrical connector (2) from the left front HO2S (1) electrical connector.
    12. Fig 5: View Of Rear HO2S, CPA Retainers & Electrical Connectors
    GM1856442Courtesy of GENERAL MOTORS CORP.
  12. Remove the CPA retainer (8) from the left rear HO2S.
  13. Disconnect the engine wiring harness electrical connector (4) from the left rear HO2S electrical connector (3).
    14. Fig 6: View Of Exhaust Manifold Pipe, Gasket, Bolt & Manifold
    GM1856228Courtesy of GENERAL MOTORS CORP.
  14. Loosen the exhaust manifold pipe to exhaust manifold nuts.
    15. Fig 7: View Of Exhaust Manifold, Bolts, Catalytic Converter & Gasket
    GM1856553Courtesy of GENERAL MOTORS CORP.
  15. Remove the left catalytic converter to exhaust manifold nuts.
  16. Using the transmission jack, lower the transmission slightly.
    17. Fig 8: View Of Catalytic Converter
    GM1856557Courtesy of GENERAL MOTORS CORP.
  17. Remove the left catalytic converter.
    18. Fig 9: View Of Catalytic Converter HO2S
    GM1856443Courtesy of GENERAL MOTORS CORP.
  18. If the left catalytic converter is being replaced, remove the HO2S (1 and 4).
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