As my radiator is out and had some some time on my hands I decided to start chasing my 80 MPH vibration. I don’t believe it to be my tires as I have rotated them and it didn’t change a thing. So based on a discussion in @CanCritterAnd
@Ross Wooldridge 1971 Plymouth Sport Fury GT Brogham & U code Super Comando...
Drive Line Angle will drive you crazy