2003 Silverado,exhaust sound

2003 Silverado, 4.3, runs good, no check eng, light, pinging sound coming from, catalyst converter,bad o2 sensor or what,

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How many miles are on it? Is your pinging sound similar to a marble in a tin can or more of a loose piece of metal or hanger viberating?
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It has 55k, miles , sounds like a rock in a tin can, if i tap on the converter with a small hammer, it go`s away for awhile,but starts back up every time i start the truck,
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