I have a 04 GX470 that bounces on every bump, dip, stone on the road, etc. It just got out of extended warranty. While it was under warranty I took it numerous times to the dealer and they said its "normal." Well now the problem has gotten alot worse. I like to drive with my head on the headrest and I just cant do it in this car because it gets thrown around too much. I had a slammed car before that drove 100 times better than this. Oh and also the steering has a shimmy too, if it could be a related problem. Any help would be appreciated or I'm gonna have to get rid of this. Thanks.