When at operating temperature transmission drops out of overdrive

What happens is the overdrive unit itself wears out which bolts to the rear of the transmission. You will need to raise the truck up and remove the driveshaft first. Here is a guide to help you get started with instructions in the diagrams below to show you how to remove the overdrive unit:

https://www.2carpros.com/articles/jack-up-and-lift-your-car-safely

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

Thanks ken L I will try it! Do you know if this unit is available at a parts outlet?

I am not sure I think a transmission shop will need to rebuild the unit.

Thanks for the info!

Please let me know how it turns out.