Tail / Driveshaft Angle..???

That's logical, BUT the rear pinion angle is OK..........

......it's the angle of the driveshaft yoke to the tailshaft that they say is screwed up..........The car was a 904 car, and has been converted to a 727..........he believes the front angle must be adjusted........

But again, it escapes me how the front angle being about 2 degrees at park would cause a vibration at cruise speed.............????