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 - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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