Mystery noise when in drive. Video..

[Tmend]

I have had a flex plate make that noise but remember it spins at all times it's bolted to the egine. Putting it in gear drops rpm level therefor making the flex plate spin slower and causing less wobble. I can hear the noise a lil in park or neutral the best way to solve it is remove the bolts from the torque converter and push the converter back it should move about half an inch. Once this is done try it again if it continues you most likely have a rear main bearing issue if it's gone then you know it's in your trans....my guess to at fist would be flex plate but I've seen it be the bearing. If noise is louder once ruck is worm it's definitely the rear main bearing.
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