1989 560SL Vibration

[Softball60]

I have a vibration that only occurs @ ~35mph as you accelerate. It does not occur when you first start to drive. As the car warms up and you drive more it begins to get worse. I have learned how to avoid by getting up to 35 backing off the pedal then continue to accelerate.

I have replaced everything know to mankind underneath starting with the engine mounts and working back rear subframe mounts.

This group has helped me out before, so I appreciate any ideas.

[tecqboy]

Drive shaft mount bearing? Flex disc couplers?

[nobby]

Hanger bearing, engine and trani mounts, flex discs fixed mine.

Tires could also be a factor.....too obvious?

[Softball60]

Tecqboy & nobby,

Thanks for the response but all of the items you mentioned have already been addressed!!

I have had this issue for a very long time. The only thing that I tried was to jack up the springs with spacers. I think it helped but left me with uneven tire wear.

This thing has really got me stumped. I like to do things myself so I have not taken it to the MB dealer $$$$$$. I am retired!!!

[Walrus]

Originally Posted by Softball60

I have a vibration that only occurs @ ~35mph as you accelerate. It does not occur when you first start to drive. As the car warms up and you drive more it begins to get worse....

This makes me suspect half-shaft bearings and/or wheel bearings in the rear... Bearing/race problems can manifest themselves in harmonic vibration, which you have somewhat countered by accel, slack off, then re-accel.

Of course, I am wrong more often than right, so this and a buck-fifty would buy you a coffee...