GMC Sonoma 4.3l V6. Vibration Coming From Rear

A buddy of mine has a Sonoma. All of a sudden the back end has a loud vibration coming from the back. It reminds of baseball cards in the spokes of a bike. The faster you go the louder and faster the vibration is. It also seems like there is a drag as well in acceleration. Any thoughts or suggestions. So far he had one on the leaf springs.
2002 is the year. Sorry just in case it matters.

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  1. Dustin W
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