i found a 90 - 96 twin turbo automatic transmission on ebay. look at it here http://cgi.ebay.com/ebaymotors/ws/eB...tem=2451648299 will this fit my 1995 300ZX NA automatic? If so, how hard is it to change a transmission? Is there a guide online or something? Something that is more reliable than my mechanic buddy? Oh and how much should i pay?

 

the tranny should fit just fine.
as long as you have the proper tools, ie. ratchet set, breaker bar, tranny jack, and a helper, it isn't too hard. Just make sure you label everything and you should do fine.
Online manual....presto change-o, abbra crapa.....

Poof!!

http://www.300zx.co.uk/cgi-bin/manual.cgi

p.s. Don't forget to bookmark this site, it contains invaluable information on correct procedures on how to diagnose and fix your car. As well as very clear and concise diagrahms on how everything goes together. Which is nice for those of us who always seem to end up with parts left over.