I had a similar problem with dw's Buick. It was a soundproofing baffle in the fender well. It was not fastened on the fender side and at 50-60 it would break loose, "buzz", then as it folded back from air pressure; stop.
With no way to gain access without fender removal, I just pulled it out with vise grips.
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Lou & Freya the wonder dog
2008 GMC Sierra 3000HD Allison Duramax
2019 Flagstaff 8529FL
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