Icebox
Observer
Front and mid axle... rear is a full live axle with all the internals, just not receiving drive.... yet!
Hey Keyblazer, Here is a link to a company I found awhile back:
http://differentialeng.com/Home.htm
I have not dealt with them so I cannot endorse them, nor am I affiliated in any way with them, but their products look good.
Your van is really cool!!! My girlfriend is wanting more (read shower) room than my EB has. I showed her yours and she wants me to not only do the 4WD conversion that we have planned but asked how hard it would be to make it 6wd!!! So thanks for such awsome pics of your rig. Good luck with your project.