Outwardly the CV joints appear to be ok. The boots are intact and there's no weird angles when the car is lifted. When the car was up on jackstands this past weekend, we rolled the wheels to check for runout on the CV's and they turned smooth and straight. Not saying they aren't the issue, but I'd suspect that the vibration from them would be similar to a wheel being out of balance since they rotate at the same speed as the wheels do. This vibration is much faster than that, which is why I'm suspecting the rather than the CV's.

The U-Joint wasn't "notchy" per-se, but it wasn't smooth and silky either. If anything the U-Joint is slightly on the "stiff" or "tight" side. Having not messed with a U-joint in decades, I don't remember what a "good" one feels like. With the DS parted, I could put the section with the U-Joint on a table, point the stub shaft in a direction and roll the DS on the table and the U-Joint wouldn't move. Too tight?

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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]