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
1 answer
Did you get this checked out? If so, what was the problem?