I've been having a lot of vibration and what sounds like tire noise (but could also be bearing) from my front end. Its an 02 4wd explorer, replaced rear bearings and FR Upper control arm about 6 months ago. Had the alignment checked and its spot on, but I'm getting this shuddering/shimmying whenever I have to put input to the right on the wheel, and its much more prounced at higher speeds, to the left pretty much smooth.

My guess is that this means a bad LF wheel bearing, since a right turn would put more force on that left wheel bearing, and also noise seems to be coming from the left side of the car. It also seems to pull to the left a little which since its in perfect alignment, i would assume means that the LF tire has some rolling resistance. Any ideas?

 

Ok, I replaced the LF bearing, no improvement. Also had four wheel alignment done and its spot on. I could really use even some shots in the dark here, anyone have any ideas??