1993 misubishi 3000 GT

Hello all;

I have a 1993 Mits 3000Gt with auto transmission.

The engine was replaced with an engine that came out out a 1994 3000GT with manual trans. Since then the transmission works and shifts only when the over drive is off(the OD light in the dashboard is on), but when the OD is on (the OD light is off in the dashboard) the transmission goes in nutral and won’t shift.

I appreciate your wisdom in posting any comment or suggestions you may have regarding this problem.