Hi, i want to upgrade my rearend to hold at least 500hp, 6 tops. What kind of rearend will literally fit in it and/or plug and play in place. I have a '91 fc

 

nothing super beefy will plug right in without mods, besides modifying a corvette rear end assembly or one from a mustang cobra or a ford 9 solid axle... your best option is a freshly rebuilt, perfectly lashed, heat treated/cryo'd Series 4 TurboII clutchpack LSD and some aftermarket halfshafts and stub shafts.

there is some good info on these setups on www.torquecentral.com in the V8rx7 forum, search for lsd and rearend and such...