Alright, thanks everyone. No vibration associated with my noise, so I'm thinking it's not wheel bearings. Hm..I guess I should have just had him replace both joints, but I figured he knew what he was doing. I'll do the other u-joint, and if that doesn't do it...I may just wait until whatever it is goes out, and replace it then. I don't have any trips coming up where I'll be the one driving, so I'd probably be ok taking that approach. Thanks a lot for all the help!
