Vibration.....Driveshaft?

That is a little encouraging, since the guy told me that I have put changing the pinion angle to the bottom of my todo list. I did measure everything a couple of years ago and if I recall I was out on the pinion by about 2 1/2 degrees...can't remember which way. I will look for the video.....Thanks.

I edited my post with the link in it. Here it is again.

I chased down a bad speed related vibration by myself and it turned out to be a pinion angle that was too nose high.