I've had a bit of a vibration at higher speeds, -could be rear tire balancing issue, but when I was pulling out the diff and drive shaft (to change diffs) I found the center bearing rubber support was worn loose. It was not supporting the shaft properly. The bearing seems o.k., and the flex disks seem fine, but I am replacing both disks, bearing support, and bearing anyway. Heck I have it all off so it is the price of the parts only, not a lot more labour. And when the replacement diff goes in it will be with all new seals, and new boots on the axles. I kinda like working on the old girl but no where near enough that I want to do stuff like this twice cause I cheaped out the first time.
Not that I'm throwing any rocks at those who need to take the cheap route. been there done that, had to. But this car is fairly low miles (140k) and I'd be happier if I don't need to get under there again for a while, and (at least till the next recession) I can afford the parts.
Maybe I'll save the old disks in case I ever am running a much older 240 and use them on that...

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Thanx,
Alberta Luthier
1983 300CD ('Stinky')155k miles, 2.47 diff, EGR removed, AAZ injectors with 265 nozzles from Sean,and vogtland lowering springs.
1984 300SD ('Old Blue')150k Klicks from Japan originally, came with rear head rests, no sunroof and never had an EGR