Very noticeable vibration on my 1995 E300D. I replaced the front flex-disc (Lemforder) about 3 months ago. The rear disc looked fine so, I left it alone. Maybe the center support bearing or ???

I had a vibration at the same speed range in my '78 300D. Checked the flex joints and they were getting ragged but weren't cracked all the way through. The support bearing and the carrier were shot. There was a gap all the way around the bearing big enough run my fingers around.
Replaced all those parts and the drivetrain is now smoooooth.

Phil Forrest

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1972 220D "Trudy," named by a friend.

"The 220D sounds good... I suspect it is the only car that you need a calendar for, rather than a stopwatch, when doing acceleration tests."
Tom Abrahamsson

Thanks Phil, getting parts today. Decided to go with OEM / Lemforder