A posi essentially ties the two rear tires together. With a posi you'd need to break both tires free to spin, not just one. That's good for performance, particularly accelleration. That's bad if you just want to smoke a tire.
A posi makes life much more interesting in the rain and snow and ice. With an open differential too much throttle spins just one tire. With a posi, you spin both rear tires, and the entire car spins around very easily. It's fun and you go "wee" when you do this at a stop sign. It's not so fun when you snap into a spin on the exit ramp or a turn on the backroads.
A posi gives better overall traction and holds it longer than an open differential. But when a posi rear loses that traction, it loses all of it, instantly. This makes a posi type rear more demanding of your driving skills.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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