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That's crazy, I was just thinking about updating this thread today.
So I did a diff flush and it all but eliminated the driveline vibration. I'm guessing the clutch packs were dragging. The idea popped in my head while trying to figure out what I was observing. The fluid was definitely never changed before. It was a thick milky grey. Went with the OEM SAF-XJ+FM, which also eliminated the humming/groaning I would get on tight turns, which was happening more frequently and on less tighter turns.
Still have a PTI driveshaft (Dorman - AutoZone) on order that I'm hoping to replace next weekend. The CSB is definitely worn as I'm constantly hearing the cowbell noise now, and there's excess slop which may be the U-Joint or maybe something else. Will update then.
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