First strap the steering wheel so it wont turn and mess up the clockspring.
Then unbolt the steering linkage at the back of box.
Remove coolant overflow bottle and get it out the way.
Then unhook the 2 hoses on top. Be ready to clean up a mess.
Unhook the draglink.
Then your ready to unbolt the box from the frame. Theres 4 bolts and you may have to jack it up and take a little pressure of the spring to get in there.
Swap pitman arm to new box and reinstall and bleed the system.
My photo buckets acting up so thats the only pics I can get loaded.
Kinda a quick overview anyways.