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I've been having the same sounds on my Passport as well. It's so bad, I took it to the dealer.

They told me there was no issue after a test drive but I'm not sure if they actually had the vehicle up on a lift to determine the issue.
 
I checked the wrench, all is fine with mine. The noise is coming from outside, not really noticeable unless the windows are down but when they are, it's very loud and very annoying. At times sounds like the part of the bolt on subframe is going to fall off!

Was thinking about attaching a GoPro to the underside and driving around to try and catch it on video.
 
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