92 f150 4.9 3 speed automatic with overdrive

[damion08]

i recently replaced my ecm because it was not letting my truck start after replacing it my truck now no longer turns off or on for overdrive the button doesn't aluminate indicating on or off it acts like its stuck in 3rd engine revs to the moon before moving unless i manually shift into first any ideas will help im going to drive it like it is because it is my daily driver thanks

 

[Fellro]

Sounds like the ECM isn't quite right, the calibrations have to be correct. Unfortunately they are not all made equal, it has to be the right program or it will exhibit behaviors as you have seen.