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 - On the Road with Dave Gohl: Tractor Club Beginnings - by Dave Gohl. I was surprised about a month ago when I got a call from a fellow tractor croonie. His message was interesting and to the point. He's says "Dave, I've been thinking about starting a Two Cylinder club for our area. What do ya think?" It was a loaded question. I said that I would be interested, and was wondering what his next step was. (Although I was talking under my breath, since I thought of this some years ago) My friend, Arlyn Lamb of Lakeville, Minnesota was sincere in his miss
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