Beat note

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Nov 9, 2008
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I've noticed a beat note in my Tundra recently. I can hear it at 30mph, and it slows down as I go to 40mph. Below 30 or above 40 I don't hear it. I d think front front end, but I know sound travels each way. I'm thinking it is not gear related, but could it be a bearing? Or worse, a tire?
 
First thing that came to mind for me was driveshaft. Is it a two piece? If it is I would check the center bearing as I have seen them cause weird things to happen when they wear. They are also usually cushioned with rubber and that can split or dry out although your truck is pretty new.
 
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