well. i had rotated them myself. and when i got them balanced, they decided the better 2 of the 4 tires and put them up front. all of them were able to be balanced. so i really dont know what to do. i'm thinking it might be rear wheel bearing so im going to go put a stethascope on that one again and see.

could it be causing vibration but not be loose and able to feel in the tire?

im at my end with this it's so FRUSTRATING!! GRRRRR