drivetrain thumping

["Brian's mail" <bsmith@domain.elided>]

I have an 82 Spider that is making a rhythmic thumping sound, seemingly
against the floorboards or drivetrain tunnel on acceleration ,especially
when tight turning.  I replaced the doughnut (broken) but the sound
persists.  Any thoughts ?  Transmission mount ?  Motor mounts ?
Thanks
bsmith@domain.elided

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