I went ahead and threw it all back together, making the assumption that the o-ring was the boot band in the schematic. Everything holds oil. no leaks. on jack stands, it checks out per their specified test. On the ground, it seems ok, I guess. I drove it around my yard in forward and reverse, 2wd and 4wd.
A few thoughts. 1. Man these things are a little unsettling when they pop and ratchet. click, click, click, POP! 2. Thank God for power steering. Even with it, I noticed it would seem to bind when turning in reverse in 2wd. So much so, that I had to quit reversing, move forward a foot or two, or the steering would lock itself in whatever direction I was turning, power steering be damned. I'm not sure if that is a normal thing, or something I need to sort out on mine. I'm gonna give it some break-in time to see if things smooth out. 3. The install really wasn't that bad. About 4hr total with taking my time. I started off trying the 'one wheel' method, but I didn't like how little room I had to manipulate things, so, I pulled the passenger side stuff apart as well, which really doesn't take any time at all. Well worth it, IMO, to be able to pull the diff straight out.
I put conventional 80w-90 Valvoline gear oil back in it for now. I'll swap over to Synthetic 75w-140 when i get back from PTO.
Now I just need to get the thing out and put some miles on it.