What is wrong with my Rear end?

I thought that my clutches were burnt out but i powerbraked it today and it left POSI, then dumped the clutch it left one, what is wrong with my rear? I did both of these 3 times each and all the results were the same so i dont knwo if my clutches are bad any ideas?
 
Your LSD needs to be re-packed. I fried my clutches at an Auto-x event and decided to throw in a Torsen T2R LSD instead of re-packing the trac-lock. I'm really happy with my Torsen (my wallet wasn't though), my car is much more stable in the turns and it seems a bit quicker too.