Had the same thing, turned out front propshaft bearing at transfer case was shot, luckily i got it fixed at the same time as NPC clutch went in.
I thought it was wheel bearings at first as I also couldn't see any problems. Can recommend a driveline mechanic if you need one.
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08 JK CRD
Locked F+R, 2 1/2" 33's
AEV F+R bars
"Dr. says I need a backiotomy!"
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