bad shaking at 50mph+

[blaze15301]

I just bought my 99 c230 its a nice car and my first mercedes. I had to replace the both lower control arms shocks and 4 coil springs. along with lower ball joints.

The car has 18" linsor rims on it. they came with the car. When i hit 50mph the steering wheel shakes left to right and the car vibrates. I thought it was the tires. I had them balanced and checked at 2 different shops. I have crawled under the car and checked all bushings no play in any of the connection points. I had the shop who did the balance look over everything and they said it was fine, but i cant figure out what it is and i cant drive the car on the highway. I am beginning to think it is the rims. i did a search and from what i have read it could be bearings but i have no noises just shaking.

thanks for your input.

[Seattle_202]

Mine didn't shake but going over roads that has been repaired or uneven roads my car will "jump/skip" to either side. Fing scary especially if you're going at highway speeds. I did everything; new tires, alignment, bushing, struts. Nothing fixed it, then my car got totaled so now it's not an issue. I think this is a common issue with many owners but I don't know if anyone has an answer to this.

[Denlasoul]

Depends on the track (width) of the wheels. Having wider wheels, and thus tires, typically extend the stance out to feel ruts and uneven roads. If you are on a smooth road, and it vibrates at 50mph, I would check out the steering damper.

[blaze15301]

the front tires are 8" wide. ive did the steering adjustment checked all bushings. the vibration goes away when i hit 80mph. ive changed to older tires and it still does in on a freshly paved road.

[berwyn83]

Had the same problem before. I did balance my Dunlop tires (http://4wheelonline.com/Dunlop.107419.0) but it didn't solve the problem. I checked the bushings and ball joints also. Went to a mechanic shop and the guy told me that the culprit could be the driveshaft since my car only vibrates at a certain speed. He replaced it, and the vibration/shaking went away.

[mbsickness]

I had the same issue with my 94 C280 and chased this issue for over a year. My car had factory AMG 170 rims and would vibrate between 55-60mph. New control arms, bushings, roadforce balance, etc....nothing would help. The culprit ended up being a crack in the rear control arm mount where the spot welds are located. I had the crack welded up and after tat the car was smooth as glass at all speeds. Good luck.