I did some checking with O'Reilly about your u-joints. I guess there are different u-joints depending on gear ratio. According to them you need:
With 3.45 or 4.10 gears:
Precision brand - part #466 (greasable)
Precision brand - part #436 (non greasable)
With 3.27, 3.55 or 3.73 gears:
Precision brand - part #377 (greasable)
Precision brand - part #371 (non greasable)
Hope that clears things up for you. I don't know what AutoZone goes by. NAPA also sells Precision u-joints and I have had good luck with them, so that is probably what I would get. I was not aware that gear ratio mattered; it seems kind of bizarre but that's Ford for ya.
BTW, about your tie rod ends - there are two listed - one left, one right in any brand - you need one of each, they ARE different, and have different size shank and thread.