ANSWERS: 2
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Sound like transmission making a noise going into second gear.
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This could also be a tire with a separated tread. Edit: Now that you've edited your question, I'd be suspicious of the driveshaft. A seized universal joint or a bad support bearing could cause the driveshaft to "whip" as it turns and strike the floor of the car body. I've actually experienced this exact problem on a car of mine. Good luck.
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