Im new to the gas side always been on the diesel discussion.
I traded a vehicle for this very clean 87 560sel with 260k miles and need some help with a vibration. It's a very fast vibration and is louder when I decelerate. (vibration isn't really loud and can barely feel it). The vibration starts at 55.
My Cummings truck had a gear bender box that went out and it almost sounds like that but the gear box was much worse.

When I do 70 and put it in neutural the vibration is still there but quieter.
Vibration there when accelerating and slightly louder when you decelerate. Vibration stays the same when you cruise.

Is this the middle drive Shaft bearing?

Thanks for your help.

At that mileage I would point to the flex discs and the driveshaft bearing.

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2001 E55

2001 E320 Sedan

2001 Subaru Legacy

2006 SLK280

2016 Subaru Outback 3.6

Agreed. You can see the flex disc if you lift the car. The center bearing has to actually come out for you to accurately tell if the bushing or bearing is bad.

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1990 190E 3.0L

OK other than cracks is the anything else to look for for bad flex plates.?

P's on cell hard to type!

So nothing else could be the culprit?

Yes, the metal rings/sleeves etc that are got into the rubber coupling of the flex disc. Jack the rear wheels up, block the front wheels, out car in neutral and ho under the car and turn drive shaft by hand back and forth in a quick, jerking motion to see if the metal rings arter loose in the coupling or if the bolts are loose.

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1990 190E 3.0L