I have a 67 mustang and put 2008 mustang GT wheels on it with 1.5 spacers up front and 1 inch spacers in back. I have balanced the tires twice and check everything up front and no bolts loose. I have also had it aligned as well. It vibrates at 40mph plus and on big bumps in the road I get a rattle which sounds like the front end. Just curious if anybody else has had this problem? Thanks in advance for any ideas.