So on my other Stroker a 02 7.3, 171K miles, with a straight pipe, cold air intake and Edge Attitude programmer, i'm having issues with the overdrive.So a couple months back i replace the shift range sensor and everything was fine, but a couple weeks ago pulling a large load uphill i went to shift OD off and the light didnt come on, and it didnt down shift. So tonight i pulled the plastic off the steering column and checked for rub wires there was none present. Then went to check the fuse but i knew wasnt a blown fuse because with the key turned on i got a small flash on the OFF indicator light so i knew it was getting juice. I pulled the button off the end of the shifter and plugged it back in, and the light illuminated OFF then i cycled the key and didnt come back on, and tried 2 or 3 more times. Any ideas or comments would be greatly appriciated, Thanks in advance.

Is it still doing it or is it only when pulling a load?
if so it might have some thing to do with your tuner.