I just swapped a tranny from a 93 into my 91 and I am not getting into 4 wheel drive. Is there a wiring difference between the two years? the plugs look identical and the guy I bought it off of claimed it worked. I never liked the push button any ways. I have always had troubles getting it into and out of 4 wheel drive. I even tried the switch out of the 93 and it is not working either. Can I just switch the servos out of mine into the new one or should I just swap transfer cases?