First A-833 rebuild, what to look for?

MOPEkidD-3 said
Where do you see that wear? Handling the gears now it definitely feels (and SMELLS) like the last time this trans was together it was filled with gear oil, not ATF. But I'm sure it could have had ATF in it at some point in the last 45+ years it's been around. Just asking because I have no idea where to look for that...
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The dis coloring looks like ATF was used at some point. I guess it could have been run low on gear oil as well. That shaft runs on needle bearing so when I see discoloring I get nervous. I usually put the main shaft in centers and check the runout. If it's round run it.