My classic seems to suffer from vibration at higher speeds say 90 plus, it feels like the whole car is vibrating a bit. The steering wheel isn't really vibrating and I can't pin point it to one place, as I say feels more like the whole car. I am going on a track day in a weeks time where I will obviously be able to get to higher speeds so would like to see if I can find out what is causing the problem before then. My hunch is rear tyres/balancing - does this sound about right?

Thanks
James

 

Yep, sounds like a balancinng problem.

 

yep, steering = front, whole car = rear.

 

Possibly a worn drive shaft joint somewhere. Worth getting it checked/sorted before you go out on track.