You will find the 5 ton had a very different drive flange for the output and input shafts. You would have top have some machining done to make adapters to fit the shafts to the t-case.
We have never torn out a deuce t-case with turned up engines, so I do not think strength will be a big issue, especially if one uses sense in driving it. The 5 ton has basically the same engine as the deuce.
You would need to get lock out hubs for the change to be fully effective, or you will still be spinning the front axle components like the deuce does. The air shift does not stop the spinning of the front axle components. Hube could be very pricey.
I have not seen a kit for the 5 tons to make them air shift. I would like to know about it if there is. The gear ratio for the front and rear drive are different in the 5 ton t-case, so the kit would have to be quite expensive and there would have to be some rather major tear-down of the t-case to install it.
All in all, I do not think you would save what it would cost to install the deuce t-case.
Regards Marti