First A-833 rebuild, what to look for?

yellow rose said

The main shaft is worn from using ATF. I'd run it as it is, but don't use ATF.

The rest pretty much covered it.

Click to expand...

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...