Silverado 1500 2WD V6-4.3L (2007)
1. If replacing the catalytic converter assembly, perform the following steps, otherwise proceed to step 4.
2. If reinstalling the old sensors, coat the threads with anti-seize compound GM P/N 12377953, or equivalent.
Notice: Refer to Component Fastener Tightening Notice.
3. Install the HO2S (1-4) to the catalytic converter assembly.
Notice: Refer to Fastener Notice.
Tighten the sensors to 42 N.m (31 lb ft).
4. Install the NEW exhaust seals (2 and 3) as required.
5. Install the catalytic converter assembly to the muffler.
6. Install the catalytic converter assembly to the exhaust manifolds.
7. Install the catalytic converter to exhaust manifold nuts (1).
Tighten the nuts to 50 N.m (37 lb ft).
