I had an issue with a vibration that first most thought was the front drive shaft, it was not that. It them turned out to be the front yoke was lost and wobbled so most figured replace the TC.
Well upon taking it down we wanted to see what the issue was, and low and behold upon using an impact to tighted the bolt on the front yoke...the issue is now resolved.
So for anyone out there, before you go and pull down your TC, check the front yoke and the bolt that holds it. Seems they can work lose over time