Busted coiled Spirol pin in the drive shaft.
Common issue on these units.
Remove the tunnel cover and make sure the driveshaft AND the input shaft of the pump are both turning while the engine is running.
Replace with a new 1/4" Spirol pin, NOT a split pin.
While you have it apart, check that the holes in the couplers, driveshaft and input shaft are not wallowed out of round
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