Are the 3-speed and 4-speed transmissions from a 1994 Caravan with the 3.0 engine in any way interchangeable? I ask because the 3-speed in mybrothers Caravan is shot and someone offered me a working 4-speed also from 94' Caravan with a 3.0 engine. I was thinking since it is the same van and same engine somehow both transmissions must bolt on the same way. Or is there a lot more involved in this than I am thinking of? Thanks in advance.