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OK,

Maybe someone has had this issue before and can help me out. There is a slight "Tin" tapping noise coming from under the bed of the truck. It's not happening all the time and the noise sounds like there is a piece of thin metal/tin flapping in the wind hitting the frame or something. Nothing with any weight or substance to it. I'm thinking it could be the exhaust getting hot and doing it's thing but it's hard to tell. Any thoughts or has anyone had this noise before?
 

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Check the heat shields out under the truck. I had the fuel tank heat shield tear loose in one section. It would tap against my driveshaft.
 
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