front/center, lsd ?, I need some info. Options

[zach]

okay, I've seen quafie(sp) front and center differentials,
and i've seen a b&M front diff upgrade. (to metal blocks with springs)


I know what a limited slip does, but i'm confused on awd drives..

Am i correct to assume , that a front diff only affects the the front wheels, and a center diff only affects the rear wheels?

where is the center dif located? is it in the tranny, or the rear end,

what's a four bolt rear end?, is it the pumpkin, , if the center dif is in the rear end , would upgrading that to a 4 spider, be the same as a 4 bolt?

please someone, I have no clue...

thanks