wat is limited slip? how does it work and when do u need to put it into a car?

LSD (limited slip differential) simply means that instead of all your engines power going to the tire with least resistance (one wheel burnout) power is equally distributed to both tires. another common name is "posi-traction". They sell LSD's for most popular cars, buy one and bring it to a shop to put it in, i wouldnt d it yourself unless u know what your doing because u need to shim it just right and theres no real room for error.

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also, go here.... http://auto.howstuffworks.com/differential.htm

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ditto ^^