This could be a number of things. I recommend you type this in to a google search : jeep kj humming sound vibration forum , and have a read through some of those forum threads to see which ones appear most like the problem you are having. You should be able to narrow it down from there.
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Jeep TJ rebuilt 4.0L, Custom Steel Roof Racks, vintage ((Jeep specific)) 15” Centerline Hellcats,
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