As mentioned, the newer trucks are a whole new ball game. Older trucks can be swapped back and forth. Not so the newer ones. Do the whole swap (entire harness/ECU/tranny arrangement) or nuttin', else you will be in for Hard Knocks University and either learn more about Toyota control logic design than you EVER cared to know, or fail.

Mike Caskey's advice is hard won by the way. I figger I'll learn from others' mistakes and invent my own, new mistakes instead.

I would pass on the deal personally. Think of the money you'll save on psychiatric meds!!!