Express 1/2 Ton Van V8-5.7L VIN R (1999)
8. On the 5.7L and 7.4L cutaway and RV, remove the retaining nuts and gasket from the exhaust flange at the front of the muffler.
9. Remove the exhaust hangers as necessary.
10. Remove the catalytic converter from the vehicle.
11. Remove the oxygen sensors as necessary.
Installation Procedure
1. Install the oxygen sensors as necessary.
2. Apply sealer GM P/N 9985020, or equivalent, to the slip joint connections.
3. Install the catalytic converter assembly into the front muffler pipe.
4. Install the exhaust hangers as necessary.
