Express 1500 RWD V8-5.3L (2008)
1. Install the oxygen sensors as necessary. Refer to Heated Oxygen Sensor Replacement - Bank 1 Sensor 1 .
2. Position the catalytic pipe to the vehicle.
3. Install the retaining nuts to the front of the muffler.
Do not tighten the nuts.
Notice: Refer to Fastener Notice .
4. Install the new seals, the nuts and the exhaust pipe flange to exhaust manifold.
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Tighten the exhaust pipe flange to exhaust manifold nuts to 65 N.m (48 lb ft).
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Tighten the catalytic converter to muffler retaining nuts to 48 N.m (35 lb ft).
5. Connect the HO2S electrical connections.
6. Install the exhaust hanger and bolts to the transmission.
Tighten the bolts to 17 N.m (13 lb ft).
Notice: Refer to Exhaust System Inspection Notice .
7. Verify the exhaust system for proper clearance and the alignment of all components.
8. Lower the vehicle.
