Jim has touched on a big misunderstanding that alot of people have, and i just want to elaborate a little. A limited slip rear end and a posi rear end are the same thing. As Jim mentioned, GM's pet name for their performance oriented rear end was posi-traction. One wheel was always driven, and if it started to slip (spinning), the other wheel would grab, thus the name limited slip. When the rear end is up in the air, and you rotate one tire, the other will usually rotate the same direction, but it doesn't have to, and it can still be posi. If you were to have a friend hold the other wheel, you can still spin yours, by hand, but if you were driving it with the engine, your friends hands wiuld get burned because his tire would grab after yours spun. Regular rear ends, like those in most passenger cars, have only one driven wheel, no matter what. They will always rotate in opposite directions when elevated.
I hope this helps!
Bottom line, Posi and Limited Slip are the same thing (unless you enter the world of welded axles, where they always rotate together, under power).
Take care,
-Chris
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