whole car noise..front and rear..

[jimmy2]

it seems like all the rear suspension arms, joints and bushings are squeaking really loud. has anyone had this and how did you get rid of the noise??? my thought is to get it up on ramps or a lift and completely hose the bottom down with oil, it might catch fire but at this point of the game that would be a plus.
I've changed out end links, control arms, ball joint and most bushings...what else could it be????