John,
Thanks for the insight on those points. Nice to have info from someone who does this everyday.
I think jdlcruiser is on the right track though with swapping things like rear axles or adding a divorced transfer case being easier than swapping cabs over. Maybe I am wrong on that, never swapped a cab, but rear solid axles and leaf springs and cross members are pretty simple tasks for me.
If you want to stack transfer cases, you can stack the gear driven section of a 203 (strongest part) with a 205 with parts from ORD and others. Air shift and cable shift kits as well as lower gears (3:1 from LoMax) are also options. You could have 1:1, 2:1, 3:1 and 6:1. An Atlas four speed can be divorced and has upto a 10:1 compound low, though thats pretty low for an expo rig.
Plenty of electric shift transfer cases are available too like NV241/3 and NV271/3, keeping another set of levers out of the cab, where only a simple switch on the dash is needed to engage 4wd and can even be done on the fly at low speeds. I recently saw a 241 doubler kit, but I dont remember where.
Using domestic (Dana, Sterling, AAM, etc) one ton running gear to create a 4wd crew cab gives you options for locking hubs, ring and pinion, lockers, easy to obtain parts, etc., where you dont have many options with Mitsu axles in the US.
The off road/rock crawling/lifted diesel domestic truck market is HUGE compared to Expo, so why not take advantage of that to get what you want out of your vehicle.
I have researched this project pretty well and am gathering parts for converting a 2004 FE-SP Crew Cab to 4wd instead of swapping that cab to an FG chassis.
Will start a build thread when I finally get it going, which hopefully will be soon.
