Sierra Classic 2500 4WD V8-6.0L (2007)
10. Disconnect the connector position assurance (CPA) retainers.
11. Disconnect the oxygen sensor electrical connectors (1, 2).
12. Loosen the right exhaust manifold pipe nuts.
13. Remove the left exhaust manifold pipe nuts.
14. Using the transmission jack, lower the transmission slightly.
15. Remove the catalytic converter.
16. Slide the catalytic converter hanger out of the exhaust pipe hanger bracket.
17. If equipped with a 6.0L engine, with regular production option (RPO) Y91, remove the catalytic converter.
18. Slide the catalytic converter hanger out of the exhaust pipe hanger bracket.
