1998 Chevy Camaro transmission swap

I have pieced this car together and when I put the automatic transmission in it didnt want to shift out of second gear. Had it rebuilt and still had same problem. Found a used one and still had same problem. The plug for the speed censor is not the original one with different color wiring but it plugs in. My question is could that be the reason for my troubles or is there something else electrical that could be causing it not to shift out right