wow, thanks for all the time you guys put in to this, i greatly appreciate the knowledge.
So, should i get a turbo 400? that has 4 speed/overdrive right? Thats what i mainly need because i will be driving my z a lot on the freeway (not very smart of me, using a v8). the reason i was leaning towards the 700r4 was because i hear a lot of people using it, the 200-4r is out of my budget, i have a turbo 350 (dont like 3 speed, and i only reach top mph of 95, that is going over redline), and i dont know much about turbo 400's.
so what should i do? how should a th400 be built, and what do i need to do to make the th400 fit in my z? Thanks again, wilson