Converting from 4x4 to 4x2 involves switching to the 2wd overdrive. Get a later one, they improved over the years. As for the computer bit, not so easy to just put in an earlier valve body. Better to start with a 95 or earlier unit. Shouldn't be too hard to find a first gen Dakota or 2wd Ram truck in a junkyard. I just pulled a 42RH for $200.