starter grinding

Professor Fate said

Okay, we seem to have become fixated on the torque convertor being the issue- but have you bench tested the starter to make sure the Bendix is kicking out properly, not just part way and not engaging completely? Could just be a worn or dirty drive and just needs a bit of cleaning up. Pop the tin cover off; inspect, clean and lube everything and you may easily be back on track.

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Starter’s fine… I have tried 3 altogether, and same problem.

I think I have a clue though… cut a window in the bell to see the starter/converter area. It appears I have a converter that has too many teeth, too close together as the Bendix teeth wont mesh with the ring gear teeth. I have video of them not working together, but the forum won’t let me post it.

I was under the impression that 904 converters were all the same up to ‘67, which this one is as it has the small hub?