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adder is correct, a posi is a lsd that has been welded on by a redneck
What the hell are you talking about. A welded differential is a welded differential. A posi is an LSD. Our track-loks in mustangs are called POSI by ford... go look at your build sheet.
You don't need c clip eliminators to run 31 splines. I'm running 31 splines. If you want a 33 spline differential you need c clip elminators.