I just bought my truck a few weeks ago and noticed a vibration getting worse. I thought many things from tranny to my tires where out of wack. Luckly, it was nice enough to have the windows down this weekend and noticed a sqeek. Turns out my rear Ujoint was shot! Two caps had no bearings at all and the other two caps where bad but not terrible. You would have thought it would have been more noticable? Anyways, just remember, don`t over look the little things! Just thought I would share