[Pyrotechnic]

I think mechanical injection 6.5L turbo diesel trucks have a standalone computer to control a 4L80E, but they have be reprogrammed since the shift points would be way off for a gas engine.

I've always wondered if you could take a computer from a newer truck, and reprogram it so it's just controlling the transmission. Might be a good deal if the computer, wiring harness, and programming service would come in at less than a aftermarket computer.