Silverado 3500 2WD V8-8.1L VIN G (2005)
1. If the catalytic converter was replaced, perform the following:
1. Apply anti-seize compound GM P/N 12377953 or equivalent to the threads of the old oxygen sensors.
2. Install the oxygen sensors.
Tighten the sensors to 42 Nm (31 ft. lbs.).
2. If equipped with a 6.0L engine, with RPO Y91, 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.
4. Install a NEW exhaust seal to the exhaust manifold.
5. Install the catalytic converter. Slide the catalytic converter hanger into the exhaust pipe hanger bracket.
6. Install the left exhaust manifold pipe nuts.
7. Tighten the right exhaust manifold pipe nuts.
Tighten the nuts to 50 Nm (39 ft. lbs.).
