I own a 2004 Wrangler and starting about a year ago every time I would go over a large bump, at any speed, the jeep would shake violently, and would not cease until I pushed in the clutch and slowed to almost a complete stop. This wasn't a problem until i went away to college and now have to drive on freeways. My Dads a mechanic but he cant see anything wrong with it. I was wondering if anyone could tell us where to start looking for the problem?? Everything is stock, except the tires are a little wider, but not much. Thank you so much.