Hey guys, I have a 2006 F150 Screw, recently it started to make a vibrating/rubbing noise when I steer to the left but it only really becomes apparent at speeds above 20mph, I can barely hear/feel it low speeds, and when I steer to the right its quite like it should be, any idea what could cause this?

 

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Bump. A google search brought me here and I think I might have she same issue because I have the same symptoms except mine is when I steer to the right. I thought it might be a wheel bearing at first but I don't think so any more.