Stop in for a cup of coffee

I have a weird vibration in the car. Happened just now on the way home. I hit 90 mph and I heard a weird "Bbbbbbbaaaaaaa" and the vibration felt like it was coming from under the seat towards the driveshaft hump side.

I'm letting it cool down before I check the transmission fluid.

It was kinda loud, I'm a little worried now
U-joint ??