Here's what I'd do. Do a Thread search for " Wife's boobs shaking uncontrollably". PM him/her and see if she's available to take a test drive with you. It may not pinpoint your problem, but it will help us build a data base on vibrations in relation to boob shaking. I have a shimmy on my '94 S350 around 60 that is probably a tire out of balance, but it produces a pretty good lateral boob shake. Or so I'm told. Worst comes to worst, you could always turn it into a science project. I can think of lots worse subjects to study after all!!

Wayne