I had the whole right side assembly looked over because I thought I needed new wheel bearings, it turned out that just the lower ball joint was bad and not that bad at all. I had the tie rod end replaced. And just recently the motor mount on the bottom front. The motor mount took quite a bit of the vibration but its still there and I am out of things to fix and I have no clue where its coming from. Big thanks to my car guy Mike tho he's been awesome.
Strange Vibration on passenger side front and/or center on 2001 Nissan Quest
by Damet in Wathena, KS on August 24, 2010
ANSWER by patrick mannion on August 24, 2010
Have you tried rotating the tires put the best tires up front and see if the vibration goes away.