I just drove it and I would describe it more of a thumping or knocking sound when in gear and sitting still and when the pedal is close to the floor in 1st. In 2nd and up it doesn't knock/thump unless I really jam the throttle and then it's barely noticeable. It's down low and maybe to the passenger side a tad from how it feels driving it.

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"Gerwalt" 1984 - 300TD