I done some trading on trans, and got a 6 rib with a after market super diff from long enterprises. Don't have any idea about how strong they are. The problem i have with it is if you are on the gas its pos all the time if you let of the gas the cutting brake will lock either tire up but when on the gas it does little to either 1. Just wondering if it is some thing in the diff or bad brake setup? I'm running sentra calipers

Sounds like a lockright or pelloquin, not a superdiff.
Jack one of the rear tires off the floor, crank the engine, and see if it freewheels or pulls both wheels when you {carefully} engage the clutch.

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http://www.youtube.com/watch?v=A5wGMaUMXUQ

thanks for the idea ill have to try it tomorrow evening if thats the case then my trading around didnt turn out to good.