Awesome Build!
I have been collecting parts for a medium duty f550 swap my self. I wanted to do what you are doing with the divorced nv273 from chevy / gmc 4500 and 5500. I plan on a ISL p pump engine like Buck, trans an rtoo9513, planning on a nv271 manual shift trasfer case, regearing the dana 135 to 4.10 etc. Cab is a 1950 Willys Pickup cab only, to make a lil rig.. I like your 19.5 singles what gears are you running in your axles?
Awesome build ! keep up the documentation!! Love it!
Thanks,
Deo