35 mph WOT power loss

DentalDart said

Converter shield isn't on... it just started. After doing the band tighter with the box wrench and then backing it out as directed.

Started it in park and the noise started after idling for a couple of seconds.

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It sounds like something scraping. That's pretty odd especially since you just did a band adjustment. It's hard to pinpoint where the noise is with the video. Nothing could have got in the bellhousing to start the noise?