For a little while now, I've noticed a deep humming, growling noise coming from the front end. After some canyon driving, I noticed the sound would vanish in right-hand curves. I'm thinking unit bearing or u-joints? I've checked play some, but it's so little, it's hard to tell how much is tire and how much is bearing play. There's a tiny bit of play in the right u-joint, the inside shaft can move maybe a thousandth of an inch, where as the left seems solid. Is that enough to cause a problem?