1987 chevrolet blazer won't shift on 1990 Chevrolet Blazer

swaped transmissions and problem went away for one day then returned. In one manual I see the E-prom and in another I see a transmission operational start switch are these both the same item justv called something different and could this be my problem??

Asked by for the 1990 Chevrolet Blazer
Did you get this checked out? If so, what was the problem?