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I know you're just trying to get your point across quickly, but I can't understand what you're saying. You've installed new motor mounts? This is the second transmission that has cracked at the tailshaft?Motor mounts second trans at the tailshaft was just thinking cheapest way to get running.
JB weld is anything but a bandaid fix for structural repairs...just saying...and it doesn't hold up to high temperature either.
Looks like he's going to be limited to TIG welding? Case replacement probably better approach. He didn't even specify what is broken, so one would logically assume it's the case? Like @kennythewelder said, first figure out why it broke.
Good luck.