A833 OD 340 4x4?

You would be way further ahead, just to pick up a complete 4x4 Dakota and sit your body on it.
You are talking alot of fabrication just to put a front axle in the 2wd truck.

Or buy a nice winch and put on the 2wd truck, to get you out of tight spots if you get stuck.
A good set of tires, with some tire chains will take you alot of places.
And drive with common sense.