Hipster
I'm Awesome
THIS. When I was a kid I remember my dad's (now mine) '89 Firebird would vibrate like mad on the highway. You could feel it in the floor and you could see the dash oscillating back & forth like a hummingbird's wings.. Turned out the driveshaft needed to be balanced and a u-joint was toast.
Years later, my wife had a 1989 Town Car. It started to have a pulse type vibration between 70 & 80 mph akin to a throbbing pain somewhere on your body. Front u-joint was worn out in that case.
I watched a Ram 1500 right in front of me lose the front joint and it pole vaulted the truck straight up on it's front bumper end over end forward onto it's roof in 60 mph bumper to bumper morning rush hour traffic. Nobody got hurt but that must have been one hella O'shyt moment for the driver.