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That explanation is a bit simplistic. A major function of "posi" (which is actually a Chevy moniker...Ford had Tru-Trac and other comapnies made up their own dumbass names) is to sense a difference in wheel speed on either side and apply most of the engine's torque to the wheel with the most traction. It really depends on the differential. I run a Torson T-2R differential which is entirely gear driven unlike...say...Auburn which uses clutches. Very different torque biasing. Then again, in the domestic world, the term "posi" is pretty much slapped on any limited slip differential. Really anything that's not a ratchet type or locker is called "posi" regardless of who makes it or how it gets the job done.
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