Whenever I am on a rough road, or at higher speeds, I get a vibration and sound that seems like something is loose. I have jacked the front end up, and have no play in either tire, up and down, or side to side. also, when making a sharp turn, I get a clunk. Any thoughts or ideas would be helpful, I am fixing to buy 4 new tires, and want to have everything right when I do so.

 

this is on the 2000 Olds Bravada AWD

 

the first thing that comes to mind when the vibration at high speeds is sway bar/ links. the clunk im not sure if thats related