All I could suggest is go to a garage and get them to check this.
If it were in to me I'd put it up on the two post lift with someone in it and get it running and inger so the wheels are spinning then use my mechanics stethoscope and listen around to pin point where it's loudest.
Now you could do it on the ground with one wheel jacked up,
The diff would make the raised wheel spin in derive/gear,
but it's a bit dangerous as the listener has to be under a car with one wheel spinning away really close to his head.
But apart from that a cheap mechanics stethy will pinpoint any noise rumble with remarkable success.
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