If there are no codes showing then its probably mechanical.
Did you buy the new shift lever from Ford ? If its not a Ford dealer part , that might be the problem. I have found this to be true with some Ford parts.
there are many ford posts regarding overdrive/shift lever problems.
read the jbnilsen post in this link, see if that applies to your model: if not scroll through other Ford posts on this site to find one that applies.
https://www.ford-trucks.com/forums/1088682-shift-lever-and-overdrive-switch-problems.html
