This has happened 3 times now in the last 3 months. The first time was about 3 months ago, thought it was a fluke thing. Just happened twice on the way to work today (45 miles). I'm driving along on expressway (70mph), small bump, dip, or whatever it was, the front end goes crazy, shimmying, alomst jerking the wheel outta my hand, scary feeling, lasts about 5-10 seconds at most (felt like an hour!). The only way I can describe it is if you've ever pulled a little singe axle utility trailer that was empty, hit a bump and watched it sway and shimmy til it caught itself and straightened back out. Of the 3 times total it's happened, once, I tried braking, the other times I just let off and coasted through it, didn't seem to make a difference either way. Also the first time it happened, I might have been slightly braking when it started doing it, can't remember for sure. When I got here today, pulled it up on a rack and checked everything out, everything seems tight with all the tie rods, track bars, sway bar, lug bolts, etc. the only thing I found was on my front pass. side, I'm missing the lead balancing weight off of the edge of the rim. I don't know if just that would make it act like that. Could my steering stabilizer shock be weak or bad. I put a new one on when I put the lift on over a year ago. I've never had a problem til recently. Sorry for the long post, but I'm hoping it doesn't jar my teeth out if it does it again tonight on the way home.