Avalanche 2500 4WD V8-8.1L VIN G (2003)
7. Slide the catalytic converter hanger out of the exhaust pipe hanger bracket.
8. Remove the oxygen sensors if the catalytic converter is to be replaced.
Installation Procedure
Notice:
Refer to Fastener Notice in Service Precautions.
1. If the catalytic converter was replaced, perform the following:
1.1.
Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen sensors
1.2.
Install the oxygen sensors.
Tighten the sensors to 42 Nm (31 ft. lbs.).
2. Install a NEW exhaust seal to the exhaust manifold.
3. Install the catalytic converter. Slide the catalytic converter hanger into the exhaust pipe hanger bracket.
