Silverado 3500 4WD V8-6.0L VIN U (2004)
13. If equipped with a 6.0L engine, perform the following:
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Unclip the oxygen sensor connector from the frame.
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Disconnect the CPA retainer.
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Disconnect the oxygen sensor electrical connector.
14. If equipped with a 6.0L or 8.1L engine, remove the exhaust muffler nuts.
15. Loosen the exhaust pipe clamp.
16. With the aid of an assistant, support the exhaust muffler.
17. If equipped with a 6.6L engine, remove the exhaust muffler nuts.
18. With the aid of an assistant, support the exhaust muffler.
19. If equipped with a 6.0L or 8.1L engine, remove the insulators from the frame hangers.
20. With the aid of an assistant, slide the muffler rearward in order to remove the muffler from the catalytic converter.
21. Remove the insulators from the muffler hangers.
22. Remove the exhaust manifold pipe gasket, if necessary.
