I have read through old posts and didn't find a solution. I have the bonnebeast in my sig and at about 60-65 the vibrating starts and then at about 75 -80 is isn't as bad. I just got this car and don't really know much about cars but I did buy a Hayne'* book to help me and nothing on this subject. The ride is perfectly smooth if I'm driving through town or something but if I hit the highway then you have free vibrating seats
. I read a post from '05 where the guy replaced almost the entire front end, changed tires, and wheels but still nothing. Anyone know what this problem could be?