I had the same problem -cracked flex plate (flywheel). Level 10 rebuilt my transmission and did not replace the flex plate. It was making the chattering noise before I took it to them and was misdiagnosed as valve chatter. So I had to pay again for them to remove the trans to replace the flex plate!
When replacing a transmission, I would recommend looking very close at the flex plate and replacing that also while the trans is removed.
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