You are right about the leaf springs and straight axle. I have been kinda thinking "Dana 30 from a mid 70's jeep", but maybe a donor Ramcharger will show up. either way, I will have to change all the wheels as it will be a different lug pattern and I want front and back to match, so... 2 axles, Tranny, and transfer case would all be needed, and it's a short short wheelbase, and that makes it more tough...