My SD seems to vibrate around 70mph and up on the freeway, also when I come to a dead stop at times it seems to "clunk" if you will back to first. Also if you drive about around 35mph in 3rd, then shift into 4th it'll clunk.

The 722 trans shifts fine, so I don't believe it's anything internal. I do know my trans mount is pretty much dead... so I plan to replace that ASAP here. I had my wheels and tires dynamic balanced high speed so it's not them either.

I tried to look at my drive shaft under the vehicle and at some exploded diagrams of it and it appears I have one universal joint by the resonator section right?

Would a bad flex disc cause these problems I'm facing... or is it probably a combo of the trans mount and u-joint I believe I saw in the diagram?

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

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