1997 Ford Ranger transmission

That is done by visiting a used-car dealership and buying what you want with the options you want. To switch from what was installed at the factory, you'd need to replace the radiator, Engine Computer, wiring harness, steering column, coil springs, brake system combination valve, instrument cluster, ...

To say it more clearly, while it is possible to do this type of modification, it is very involved and time-consuming. Most shops and mechanics won't even do it because of all the unknowns and potential problems they can run into. They can't plan for all the unexpected things that can go wrong so they can't include them in an estimate. They know you won't be happy if there are minor annoyances afterward that can't be ironed out, and it's the shop you're going to be unhappy with. The only time a mechanic might try to do a huge job like this is for themselves when they don't have to account and charge for their time.