I submitted an article for the Tech
but I see it still hasn't been posted yet (moderator must be busy wheelin'
Anyway, removing the box is easy enough. Mine was a later Mercedes (ZF) box as yours is a Saginaw but they should come out the same way.
-To eliminate alignment headaches: lock your steering wheel (remove the key), and try not to move your front wheels. I recommend using ramps, as opposed to using jack stands, so the steering shaft goes back on exactly the same way it came off.
-Pull the cotter pin and unbolt the drag link Tie Rod End (TRE). Use a "TRE puller" or "pickle fork" and pop the TRE out.
-If you have to remove the Pitman Arm from your steering box (to put it on your new box) now's the time get it off. Beg, Borrow, Steal a pitman arm puller! These can be tough to pull off. Even with the puller, it may take several applications of heat (torch), penetrant, BFH, and sweat. If your new box has a pitman arm you just bypassed the biggest PITA of the process.
-loosen the steering shaft coupler (collar) on the steering shaft.
-Unbolt the bottom two (rearmost) steering box mount bolts from the frame rail. Loosen the upper (forward) bolt, so now the box is loose. I find it easiest to pivot the box down a little to access the power steering line fittings and slide the steering shaft coupler off.
-Have a drain pan ready, pull your power steering hoses off. Remove the steering shaft coupler bolt, and slide the coupler off the box input shaft (mine needed coaxing with a pickle fork).
-Remove your remaining box mount bolt from the frame rail, and be ready to catch it.