Hell yeah...got a rear clunking noise!

Noticed a nice rear clunking noise when I am at a slow crawl pace. I was in traffic this morning and noticed it. Not sure how to explain it really, but I notice it in reverse and when I am at an idle or slow mph. I did several searches but not really sure just yet. Any thoughts?
Jared
Ok, so let's say worse case scenario I need to replace the rear end. What route should I go? So far I have no mods, plan in LS6 intake and TB, LT's with Y and I already have a lid and CB.
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Otherwise with the rear tires in the air when you turn one the opposite should also turn. When I lost a 10 bolt posi it had a lot of play and I could muscle one wheel without the other turning.
You sir are not helping the situation...
But it does give me a reason... 




