I've changed a few hundred U joints with various types of presses, and never damaged a yoke. Of course, real life experience is always trumped by someone's internet research! I'd like to hear someone explain how those yokes with tapered holes are manufactured a few million at a time.
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
