Express 4500 V8-6.0L (2010)
4. If equipped with dual catalytic converter pipes, install the right catalytic converter in the muffler. Tighten the clamp nut to 54 Nm (40 lb ft).
5. Install a new gasket and the nuts retaining the left catalytic converter to the muffler flange.
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Verify that the exhaust system is properly aligned and tighten the right catalytic converter clamp to 54 Nm (40 lb ft).
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Tighten the catalytic converter to the muffler flange nuts to 48 Nm (35 lb ft).
6. Lower the vehicle.
