Hm, 160k on original wheel bearings is a lot. On a different vehicle of mine I got away with 187k on some of my bearings and they definitely showed weird signs that it was time - not the typical howl noise. I wasn't getting any of the apparent bearing issues that they usually present. I even ran into pad knock-back as they got really bad. You said it's on jack stands - you're putting it into drive and listening under the vehicle? Can you nab a video of what you're doing when there is no load on the vehicle? Otherwise, pretty weird situation here and be sure to report back and let us know once you find out more info.
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