the 4.06 gears thread will help you out with some of your question like how an automatic reacts with shorter gears, you shouldn't need the driveshaft, and there is NOTHING special about a 370nismo rearend it is the exact same as the sport rearend. Easiest swap for you would be a sport automatic rearend but that is the same ratio as what you have already and there is limited support for aftermarket LSD's.
Also instaling an LSD in ANY differential is basically the same, the only LSD's that are more difficult to instal are center diff's on an AWD and FWD cars, also porches and corvettes suck to install as well. that said you need the proper tools, information, and parts to do it. If you want aftermarket get a manual rearend as they make more LSD's and gears for that case.
(also the stock lsd is failure prone and sucks anyway)
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