if it all started with the flex disc installation then that is where the problem is.you need to put car up on rack with engine running and in drive ,look very carefully at the disc behind trans and make sure that it's turning in a perfect circle with no runout.for ex.get a large screwdriver and hold the blade close to flex disc while the drive shaft is turning and see that the distance stays the same as the disc goes around.i'm betting it doesn't.
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