Problems with vibration!

[rcllauw]

My FTO vibrates after I changed my springs to Eibach! Need help please!

Hi there.....I'm new here. I got a question, but, before that, please allow me to explain prior to the question.

I just changed my original springs on my FTO to the Eibach springs (two Saturdays ago to be exact). From then on, my car vibrates whenever the speedometer reached between 30km/h to 50km/h.

Therefore, I sent my FTO back to where I installed the Eibachs. The workshop claim that the problem lies in my drive shaft. So, I took it to another mechanic to have it checked. He replaced the drive shaft but there was no problem, so I put my original drive shaft back on. So I took is back to the tyre shop and replace the Eibachs with my originals, and the problem was gone.

My question is: What could be the cause of this problem?

 

[Fluffy]

when u accelerate..the sound goes faster and faster..it would be ur driveshaft.
but if the vibration is at a constant "tone" then it could not be the driveshaft..
but anyway..it could be ur bearings..check them out.

 

[rcllauw]

Thanks for the input.

Vibration stops after 50km/h.

 

[jombiee]

You changed the springs only right, replacing the standards spring fixing to your standard abs ? if the eibach shorter(sports type) ?
if this the case than you need a short stroke abs to match your springs.

 

[rcllauw]

Noted with thanks. Will look into this and fill you guys in later.