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Old 04-30-2021, 09:32 AM   #6
rslifkin
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City: Rochester, NY
Vessel Name: Hour Glass
Vessel Model: Chris Craft 381 Catalina
Join Date: Aug 2019
Posts: 7,550
The point where a damper plate rattle starts does vary, so they may not both rattle at the same rpm. And with cold engines 500 rpm in gear may be ok, idle will be higher when fully warm in most cases. But you mentioned raising the RPM didn't eliminate the noise, so chances are, the trans is going to need to come out.
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