98 taurus , vibration feels like it is coming from the right front but hard to tell.
some times it will be smoothe but most times it starts to shake at 50 and up.
new tires balanced, replaced rotors, replaced right half shaft. No help.
any one have an idea what could be causing this?

 

sounds like tire tread separation. take to mavis, other large tire chain look at tire closely sounds like a tire problem.....

 

I have had two sets of tires plus swap front to rear with no help, will take another look though.
thanks rlevy

 

could be a bushing on your struts....

 

I just had this problem on a customers car the other day it was the cv shaft changed both no more vibration