Help! Small block 360 has a knocking sound

CheeseRules01! said

If it was in the flex plate, then wouldn't it knock just as loud no matter what gear you are in? I'm not saying that I don't believe you guys, but it just doesn't quite add up. Like I said, the knocking is only there in certain gears, which is kinda strange.

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Not always. Had a Ford that was 3.5 hours from and and I specifically told the customer to double check the flex plate/flywheel and look at it very close.

A few days later he called and was going to pull it and send it back. I burned a day and drove to his shop and what did I find?? Several small fractures that would make noise in weird ways.

Lost a whole day of making money. Look very close. Very close at that flex plate.