It’s the 6.0L Powerstroke. Just replaced transmission and now the transmission thinks it’s in drive and will not shift out. Nor will it crank.
First thing would be to double check your installation. Look close at the gear selector switch. Did you use the old one off the old transmission or did you install a new one. Was it installed correctly if changed. Did the new one look the same as the old one. Could it have been installed wrong? Just a few questions to answer in order to help determine the cause of the problem.