I just bought a 2004 grand cherokee limited. I have noticed that when I drive on roads with dips the back end shimmys, like I'm on ice. Someone told me it's bumpsteer. It doesn't happen on bumpy roads, just roads that have little dips in them. It drives great on the highway. It feels like the back end is swaying side to side, almost making me nauseous. I have a warranty on on it for 3 months, so I would like to know what the problem is. Help?

bump"STEER" refers to the front end. you most likely are having a swaybar issue,actually sounds like there isn't one on...crawl under there and see what condition it's in

x2 for bad/no rear swaybar.