The truck is the gasoline 460 engine and E4OD transmission with 100K miles. Runs great and pulls a heavy load.
When the truck is started, I cannot move the shifter from park to any gear. The shifter lever will not pull back. I think that there is something either the ignition switch or an electronic solenoid that prevents shifting the truck from park while it is not running.
So if I turn off the truck and leave the key in the run position, the shifter will release. While holding back on the shifter while in park, I restart the truck, I can then shift into any gear and the truck runs fine. Then if I stop and put the truck back into park, I must shut off the engine, hold back on the shifter, start the truck then shift into gear.
This just recently started happening.