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Whirring from flex plate?

just today, my truck began to make a whirring noise from the flexplate/converter area. The plate has a slight wobble in it, maybe 1/8". I had a bad U-joint on the yoke end of the drive shaft and replaced it two weeks ago. Is this sound from the tranny, torque converter or flexplate? Any help is appreciated.

also the noise gets louder when in reverse