Interesting thread. Since I am pretty handy, retrofitting a 2WD 4L80e to 4x4 seems like an easier proposition .. I would think having the TOSS at the transmission instead of the transfer case would be better off road. And DEFINITELY for operation of the PTO. Having the torque converter locked up would mean much easier engine control off the generator governor. Currently, there is an overspeed protection system and a ramp signal generator to compensate, these would be unnecessary with a locked up torque converter.
There are scads of 2WD transmissions out there. If all I need to do is have 35 thousandths machined off the existing transfer case/ transmission adapter, that is an easy thing.
Also, I intend to move the engine forward 1-1/2" to compensate for the increased length, meaning no driveshaft work. The 1031 has three driveshafts plus the TC neutral safety switch. Also no modifications to the shifting mechanisms. Looks like some modifications to the oil pan but these can be done without removal.
Edited to add: The stock TH400-NP205 8-bolt will work fine with the above modification, getting the 2WD version of the 4L80e will have the tailshaft housing to use as an example for machining. The 4L80e will need to have the full spline length and 6" stickout with tailshaft housing removed, some of the tailshaft will need to be removed. And I will need to research the tachometer input signal, think it is a 40 tooth per revolution Hall Effect sensor.
So for a few dollars to get the adapter machined, it looks like a go. Note again, this is a stock M1031 with NP205 figure 8 bolt pattern transfer case.
Yes, there will be an electronic control system. But it already has an electronic governor for the generator.