As topic, is it the diff? You can hear it under heavy acceleration
A plastic gear striping
JATO, MERV, 4-TEC, & NITRO-VEE
I'd say that's the diff. Try sitting in a chair and put your feet on both rear tires and give her a little blip like in the view. If it makes the same noise then the rear diff is toast. You can do the same test for the front as well, just don't hammer the throttle or you can break stuff.
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Dye-no-mite Pow-er Go Fast, Wirrrrr Screeeech BOOM
Try driving in reverse, if it doesn't make the noise its likely the rear in my experience