Rear end noise in my 2006 Mustang V6

Need a little help here. I have a 2006 v6 with a factory rear end. Just recently the car has been making a sort of grinding/crunching sound when stopped and I'm almost positive it's coming from the rear end. I'm thinking either bad ujoint or bad gears in the differential. Its quiet when going down the road but does seem a tad sluggish. I don't wanna go to a shop and spend tons of money. The car only has 32000 miles on it.

Ps i did have the spare tire on the car for about two weeks after a blowout.


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