904 just gave up

n.y.340 dart said

I would put on jack stands and check fluid and run it. I had the pump lugs break off, instant neutral. Just saying, hope it works out.

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if you do that, please note that it will still have to be level for checking fluid level.

I don't know if your app is similar situation or not, but I took my stock 66 sl/6 Dart w 904 to the drag strip, and cracked the converter to front pump drive dogs on the converter neck.