Back when I had a control arm problem, the front end would make a funny, sustained vibration when hitting even the slightest pothole or small bump. It was noticeable primarily at lower speeds (20-30mph). Fortunately I had it replaced under warranty (in '02, I believe). I was probably at around the same mileage as you by this time. Funny, they still have that problem. Has been fine ever since. Good luck.