My truck will not go in any other gear but first gear?

It sounds like you have a gear range sensor that is not working, but to be sure we need to run the codes this guide will help. I have also included the gear range replacement instructions case you need it. you can get a code scanner from Amazon for about $20.00.

Here is a guide/video to show you how:

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

Here is a scanner link:

https://amzn.to/3Qi1SS6

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