have had the same thing happen to me and my 99 gs300. Given I told my man "time wasn't that big of deal" cause i've got backup vehicles. it's been there for 2 weeks. My man I referred to is an alignment specialist here in Nashvegas, puzzled as to what it is, exactly, that makes the same noise as a bad bearing on the axle. It's something he can relatively do easier than i can at home because of the facilities he has. He is overly qualified and I am relatively a decent mechanic being all though my forte is in aircraft. He replaced the bearings and the noise is still the same. I'll get back with final detailed results after the dissection of this hideous disease takes place.