Auto transmission swap

I have a 1989 Dodge D250 pickup with the four speed manual trans and I also have a 1990 Dodge D150 pickup with a three speed auto w/ electronic overdrive (button on dash). Both are 5.2 liter engines. I want to swap the auto trans into the 1989. Has anyone done this before and what wiring problems will I encounter with the overdrive transmission, if any. Both vehicles are complete. Any help would be appreciated.........thanks