[blykins]

I also wanted to note that it's called "limited-slip" because there is a limited amount of slippage before both tires pull in unison. Most high-performance AWD cars (Porsche 911, Lambo, etc.) have limited slip diff's between the rear and front axle. If the back tires spin at a high rate, this is either sensed with a fluid or more than likely with a computer sensor, and it will lock up causing the front tires to pull with the rear tires.