I suspect that the U joints are out of phase. You said that the splines only go together one way, and that is as they should be. But if this shaft has been "remaned" then someone might have welded the spline shaft to the end yoke incorrectly. Check to see if the shaft end U joint at the double cardan joint is in good alignment with the U joint at the other end of the same shaft. A possible mistake would put it 90 deg out of sync. The non movable yokes on both ends of the shaft or tube must be in good alignment. I have seen this kind of error occur. But I have also fought with the double cardan joints on the front driveshaft of my snowplow truck, and I totally misdiagnosed that until I had taken the driveshaft out of the truck.
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