A833 OD Iron case repair

I bought this transmission site unseen for $200cdn. All I knew from the guy was that it was definitely an A833 but couldn't confirm if it even worked. Turns out it was exactly the transmission I needed (for an Abody) and it seems to operate fine. From what I've read its a bit of a rare bird. Only issue is that I have to repair the shifter mount.

Should I tear down the tailshaft to do this weld?

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