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Discussion Starter #1
A bit over a year ago, my car developed a noise and vibration from 75 Kph to 95 Kph (45 mph to 60 mph). Anything below or over this range and the vibration stops. I lived with it, but I'm now fed up with it.

A mechanic friend told me the driveshaft may be out of balance, but he's not equipped to diagnose it. According to him, the joints & center bearing seem good, though if I have to have a shop rebalance the shaft, might as well change the bearing while they're there.

Can anyone confirm this diagnosis or maybe have another idea about what can cause this ?

Car is stored until next April, I'm gathering information meanwhile.
 

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Whistles
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I've had an old tire do that on another car.

I broke a MK3 driveshaft u joint, but it was distinct to me.
 

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I had something similar to what you are describing. I had replaced the driveshaft center bearing, u joints, rear wheel bearings and had the driveshafts balanced. I had a tough time trying to drive and diagnose the problem so I had Gamble come out and help me. He could feel the vibration in the stick shift so we jacked it up to take a look and it ended up being the driveshaft center support bearing. Even though I replaced it the new one was bad too. I went with a better bearing and it drives much better now.
 

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As mentioned above the driveline components are suspect.

But also do not forget to check the following.

Bent wheel can do this. *even a slight one*

Wheel bearings can do this.

Half shafts can do this.

Tie rod ends and ball joints can also do this.
 

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Well it's helpful to know where the vibration appears to be coming from... right rear, directly underneath you, etc. But either way, like Khlause said, it's in the driveline components. The vibration you described is caused by some kind of imbalance in a rotating part and that could be any rotating part related to road travel. If you had tie rod ends and ball joints have other failure indicators. You could check the center support bearing. Blown shocks can also create vibrations but that would be consistent at all times within the speeds you described. But my 240 had vibration issues at certain speeds and the same vibration was intermittent when accelerating... that ended up being my rear subframe bushings. I didn't feel like dropping the subframe and dealing with the removal and installation of those bushings, so I bought an aftermarket rear subframe collar kit... after installed, problem fixed. But your issue, without more details and locations, seems like driveshaft or center support support bearing.
 

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If you don't feel it, probably not the driveshaft needing balanced.

Mine had been disassembled and then incorrectly reassembled by the previous owner. Saved me a grand off the asking price from the horrendous wobble coming from the back half of the car until I hit 40mph.
 

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Discussion Starter #9
The center bearing was changed - no improvement.

Then the driveshaft was again taken out, balanced and they changed the "joints" or whatever they are called in english for greasable ones. The vibration is now gone from that speed range, but present at 60-70 Kph. Very weird.

I plan on having all wheel bearings changed this summer to rule this out (and freshen things up).
 

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Wheel bearings will NEVER cause a vibration/wiggle @ 60 KPH.
How many things have you checked besides the drive SHAFT?
The condition has to be replicated on a hoist/lift to see what is wiggling.
Tires,wheels and yes,even a warped disk brake rotor.
What rotates @ 60 at the same speed as the tires is Rear half shafts as well.
The drive shafts rotate at 3 -4 times that RPM.So does the engine.
If you feel the vibration on your ass,it's in the rear of your car.Steering wheel,in the front.
Bent wheels are common.A bent rear stub axle is not.
 
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