I want DETAILS, like why is my XK shaking over 70 mph?

 

O that could cost you man. Take it to a jag dealer for diagnostic test, it's probably something in the wheels. We had our bearing and bushings replaced.

Although if you have P zero tires it could just be that these are racing tires which isnt the smoothest ride.

 

It's hard to call. Up to about 68 mph, no problem at all. 70 mph-80 mph very obvious shake coming up through the steering wheel, but no problem tracking etc.

80 mph and over the shake actually gets less.

 

Pzeros all the way around on mine. but they WERE new with the car. Surely can't be just the 'name'. I am hopeing for a bad wheel balancing. Take it to someone you REALLY trust and have them redo it, unless you're looking at upgrading the wheels/tires anyway. Which case, that'll be a short waste of the hard earned cash.