The way I do it.
Ok here goes, First off our steering gear fits 80 to97 f series, and most super duty, e series from, don't quote me but I think 76 ish to late 90's and ranger pickups.
If it is leaking out the top it has to come out of the truck, removal is pretty straight forward, rent a pitman arm puller or buy one for 35 bucks and have your friends donate to the beer fund. Side note if the pitman shaft is sloppy in the box, find another one or go reman, I built a tool to ream it for a bushing but it is not cost effective. Anyway I cheat a little, I pull the pitman remove the snap ring and then with a pan under it rev the engine a little and turn the wheel to the stop a couple times and it blows the seals and spacers right out
. Trick that the old timers let slip. If that is all you need to do put in the seals and spacers, I usually stack them opposite the diagram to wear on a new surface on the shaft. there is a wide seal and a narrow.
If you do the whole box seal, just throw it on the bench, remove input snap ring pull dust seal and washer and oil seal, clean, put in the new ones and allset.
There are some great instructions in the seal kit i will try and find them and post, i am in the middle of a kitchen remodel so I may have left out something.
If you are patient you can disassemble the whole box and resea the internals. Lots of work but you will learn how it works, might learn some new words too.
Power steering fluid should be changed every 50k my guy's tell me, that aluminum ford pump is not the bes they could have done,NAPA sels a conversion to an iron saginaw. Questions are welcome