The company that I talked to in my area (Oregon) that narrows axles is called "Six States". They narrow the housing and send out the axles out to be cut and re-splined.
I am loading pictures through Photobucket.
Here is my new truck, I sold the Chevy that is in my sig.
This picture is the side view of my wheels sitting out side my fender.
Great idea on running the 4500/5500 front running gear to get the 10 lug upgrade. I went with the MMW arms to do mine. I still need to figure out what to do with that cross member and get the stuff to parallel 4 link and watts.