So how about some description of what you're doing and maybe some links to pictures?
We tend to think trucks are for hauling here in the Big Bolts area, but with more information might be quite a bit more helpful.
My bet is you'll be doing a lot of your own engineering to put disks that support passenger car stuff on the front of a 4400. But now that I have a better idea your objectives I think I'd suggest a different approach.
First though I'd like to know how you are modifying the frame?