So after 4-5 posts later and some info from a bunch of guys here on this forum i have come to the conclusion that I will keep my 7.5 housing but just swap out the internals and upgrade to disc brakes(which i alrdy was planning to do). What i need to know is what f body posi unit can i use and as for the s10 does it matter on the year of the s10 or can it be any posi from an s10? From bits that i have picked up around the forum, i hear that i can get a posi unit out of a camaro or firebird and use their posi units but because its 28 spline axles i would have to swap them out for GN ones or can i use the same axles off of the car either the camaro or firebird?? My MonteSS has a mild 454 and its gonna be 50/50 street and strip.