Rear Suspension Noise?

It sounds like something is clunking in the rear when I turn my car. I first noticed it this past weekend at the New England Dragway. When I'd turn off the track I heard something clunking/banging from the rear. Does anyone know what this may be? I for drivetrain mods I have a d&d t56, an alum. d/s, and 3.73 gears.

I should mention that earlier last year I had a bad rear end leak when a tire shop jacked my car from the diff. They bent the diff cover and it sprang a slow leak. I never got around to buying a new cover b/c of time constraints. I just pulled the thing off, bent it back to stock like specs with some pliers and then reinstalled it with lots of gasket goop and a new gasket. I know for sure that it hasnt leaked.

Any Ideas?
-Fawcett

the suspension is all stock -nothing done to it at all. i do have cobra r's measuring 10.5in wide w/ 275 tires out back. but i have heard many people running tires wider than mine so i dont believe that they would be the problem. does anyone know what it sounds like when a rear diff. is going bad? when i do burn outs i do get both tires to spin/smoke so the diff. clutch(s) should still be fine right? i have noticed that my tires rub my exhaust but only a little bit.

would bad bushings do this -they are stock.
-fawcett
1995 Gts, frpp 340bhp 302, d&d viper spec t56, brembos, full mallory ignition, blah blah blah