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Originally Posted by CSI-LEVEL3
Your hearing exhaust resonance. It's a problem with stainless steel exhaust systems. Chevrolet is aware of the problem and has a stainless steel flexible exhaust attachment that will fix the problem. This is covered under warranty, and they do have a service bulletin on the problem. It seems to be happening alot with the 4.3, and 4.8 engines. I had the problem with my 2002 silverado ext. cab. They installed the flex exhaust, and the problem is completely gone. Good luck, and ask top see the service buletin, it will explain how the flex exhaust works.
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Thanks so much for the info. Have appointment with dealer thur. will tell them about the fix. Thanks again.