Lsd, i know it has been done!!!

[Drifter240sx]

i did the "search" thing and found nothing i was loking for but a lot of other info that wll become handy. i wanna know what i would be looking for in an USDM car at a junk yard, what would i ask to see, what should i look for and what will fit in a '91 240. what nissan car, what other parts (i dont want other parts). i just want to find a good lsd that will bolt right in. i dont like running peg leg down the track and i want to drift and track race? THANK YOU!!!!!!!!!!!!! :help