Fighting a vibration that persists around 70 mph. Was thinking bad u joints, but I'm second guessing after looking it over. I am noticing some play in the yoke. Not sure if that much play is expected. If it isn't...is it because the tailshaft bushing is bad or because the u joint is failing causing it to move... Video link to below that shows the movement. Thoughts?
View: https://youtu.be/3-CenJAxdRw
View: https://youtu.be/3-CenJAxdRw
View: https://youtu.be/3-CenJAxdRw
View: https://youtu.be/3-CenJAxdRw