stick with the MT. That is one tough trans and it was used in cabovers and buses in the 3rd world from what I've heard.
The 89-94 should bolt in. The only differences were internal, basicly synchro changes. 95 and after had a different input shaft and different counterbearing( probably lighter duty for the mass soccermommobile market of those days).
I haven't had to do my trans yet but it's alway in the back of my brain as it has 255K on it.
Ats ae not for me...

dave h.
'89 Raider V6 5spd;Aisin Hubs;; Gen2 LS: frt. brakes, rear coils;U.C.arms;R.trailing arms;idler arm; rear LSD axle w.disc brakes ;2 battery system for Dog's fan; relocated ECU; custom bumpers;J.Baker receiver;Conferr roofrack; t-bar crank.