To replace Catalytic Converter on 6.0l and 8.1l engines, lift and support vehicle and remove
Muffler. Remove the retainer and the pipeline heater from the connector position assurance (CPA) (1, 2). After that, unfasten the left
Exhaust Manifold pipe nuts and the Catalytic Converter, sliding the Catalytic Converter hanger out of the position of the exhaust pipe hanger bracket. Remove the
Oxygen Sensors if replacing the Catalytic Converter. While installing a new Catalytic Converter apply some anti-seize compound gm p/n 12377953 or similar provided to the thread of the old oxygen sensors and install them then tighten up to 42 nm (31 ft. Lbs.). Replace a new seal to the Exhaust Manifold, then you can install the Catalytic Converter by sliding the hanger into the exhaust pipe hanger bracket. Reinstall the left Exhaust Manifold pipe nuts and tighten them up to 50 nm (39 ft. Lbs.) and reconnect the Oxygen Sensor electrical connectors (1, 2) as well as the cpa retainers. At last, reinstall the Muffler and lower the vehicle.