It just... came out of nowhere the other day. No snapping or popping indicating something was wrong right before it happened. Now there's a thwacking at speed. And I cannot for the life of me figure it out. Stab links are tight. There's a little noise from the bar, I think I knew that, though. But this loose-sounding, almost vibrational issue REALLY has me worried. Anyone else ever have this? I'm about to put it up on jack stands now and search for anything I can find.