[A Cobra guy]

I've got 48,000 miles on my EM with a Lincoln IRS. I've got a stock 302 so the loads aren't that great. It has worked perfectly. In the last 1,000 miles I am starting to get a faint low pitched growling sound from what I believe is the right rear. (Sounds like a knoby snow tire on dry pavement) My local mecanic ran the car on the lift and couldn't find anything.
Unless someone has a sugestion on what to look for I will keep driving until the noise is louder and more consistant.
hints: noise is not yet consistant
rotated rear tires, no change in noise
sometimes louder during a left hand turn
not engine nooise, definiatly drive line.
seems to get quiter when you aply the breaks.
Any ideas?

HarveyR