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I wouldn't be so quick to rule out a drivetrain issue. When in gear, engine RPM is tied to drivetrain RPM. So it could be that at a certain RPM something in the drivetrain is rattling, like the DMFW or the driveshaft carrier bearing. I've heard trans input shafts make some weird rattles too.
I'm not saying it necessarily is outside the engine, but I wouldn't rule it out entirely from a 10s video either.
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