The driveshafts that trip my trigger are the ones that are assembled on a fixture that holds the U joint centered, and melted plastic is injected through a hole in the yoke to fill a groove in the bearing cap. The replacement joints use the internal snap rings, but the inner faces of the yoke ears aren't always machined accurately. This results in excessive runout of the driveshaft and an annoying vibration.
Jerry
The DS I just installed in my 65 was the plastic injected style. I heated the yoke ears until the plastic came out. Then I cleaned it up and installed a conversion u-joint With C-clips so it could mate with the 12 bolt rear in my 65.
Did the same thing with my 63. Both drive great. The front of the DS has a balancer from the factory.
