I have seen them broke before, on a freshen up on my dad's 904 in his street/strip Dart Sport. I just cleaned and welded. The factory welds are not that good. But make sure all the planetary gears and pins are ok. There is a lot of casting flash in the trans, same as engine blocks. I clean it up .
That's good to hear. Definitely a concern that a piece of flash could fly into the gears and make it noisy. Guessing that may have already happened to be honest, as I did find a small pile of aluminum under the filter.