im a dick
i meant 7.5" sorry mate
ive got a 7" welded diff with bolt in shafts i was trying to fit and it didnt fit

what does the 4.. and high 3.97 etc diffs come from?
i know that a 3.77 comes from a scorpio cosworth as i had one of those
as said im not bothered about a lsd as im going to go quife

dosnt the m reg hubs fit in place of sierra hubs?