Im not a big fan of the 700, It's what I have, so i'll make the best of it. A 4L80e is the new trend in swaps in the MV community, rebuilding and adaping it to older transfer cases to non computer trucks is expensive and time consuming. Then there is the issue of controling it with a stand alone computer, By the time you get done, you have to ask your self if the effort is worth the result. I was lucky as my truck had a simple conversion when I bought it. 700R4/27spline NP205 TC. That way, if I burn it up or break it, I can just shove another one in.LOL. If the Allison AT545 had the same 1st gear and final ratio as the 700, I would make that investment. Set it and forget it, HA!
1986 M1031, Banks turbo,700R4,4.56 gears.