Mopar Muscle did a full rebuild a while back(with help) and looks to be very simple if you are familiar with taking apart gear boxes, 4 speeds, whatnot.
I thought they had to press a shaft or bearing back in(manual or electric hydraulic).

http://www.moparmusclemagazine.com/techa..._box/index.html

This is an article of a saginaw steering box:
http://www.moparmusclemagazine.com/howto/mopp_0103_how_to_install_saginaw_steering_box/index.html

Have fun.

The Mopar Junky