overdrive is blinking, truck will not move?

We need to scan for codes, and I need to ask when you put the truck back into park, does it make any noise? Also does it move in reverse? You may have broken the input shaft to the transmission, but I would run the codes first, this guide may help as well:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please go over this guide and report back.

I will have my buddy with his scan tool come check for codes. There is no noise when I put it in park, and it doesn’t move in reverse.

If the fluid is full then it sounds like something is broken inside. Here is how to remove the unit so you can get it rebuilt. Also, this video has the job being down on a similar vehicle so you can get an idea of what you are in for.

https://youtu.be/3vJAojsrfuU

Check out the images (below). Please let us know what happens.