Transmisson swap, how difficult would it be to put in a four speed with overdrive?

You can do anything you want it just takes the parts that go with it such as the computer and wiring harness, also it must bolt up to the engine that your truck has, and the driveshaft yoke must go into the back of the transmission as well. I can help walk you through the process and this video can help you get started:

https://youtu.be/3vJAojsrfuU

Let us know what happens and please upload pictures or videos of the problem.