As far as your diff shaft, my memory is a little foggy (it's an age and time-of-day thing), but I'm thinking the reason the shaft has to come off to the outside is that the pinion gear is a larger diameter than the seat for the inner seal, so that you're going to have to find a way to get that brake drum off of there. I have a recollection that I was surprised at how far I had to back off the set screw to get it to clear. Apart from that, I've had to clean them up as best I could and use a little penetrant sozzled into the keyway and very mild heat (no more than a light application from a household propane torch). I recall them coming right off once I got them loose, but it may take a three jaw puller to get them started.
On the bull gear, there shouldn't be anything other than the nut holding it in place and it's likely the gear binding on the shaft. It could also be crud on the shaft binding when it comes to the bearing. Was it dry in there? Another possibility if your movement is less than the 1/4" is that the shaft is stuck to the inner part of one of the bearings -- if the bearing is shot, you could be stuck but still getting a little lateral movement that way. What you might try is fashioning a couple of wooden wedges to hold the bull gear in place side-to-side and then do a little light tunking (NO walloping! I don't want you breaking anything, either.) with a soft-face hammer (or a regular hammer on a wood dowel) on the inner end of the shaft to see if you can get it started.
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