General Maintenance & Repairs - Vibrations: challenge mode

My car vibrates, and when I say vibrates I mean it feels like your whole body is being attacked with that stupid thing the dentist uses to clean your teeth. Its a very high frequency vibration.



Recent changes:

A4->M6, added poly trans mount
Stock exhaust -> LM1
Swapped all 4 sway bar links for poly ones

Let me add that this is at highway speeds. If I accelerate SLOWLY up to 65-70ish theres no vibration at all, but if I gun it then it vibrates all the way to wherever I'm going. It doesn't seem to be related to the motor or exhaust, I tested this by putting it in neutral and killing the ignition. It happens no matter the gear, exactly the same. Anyone have any ideas? I thought it might be the driveshaft but all the weights are there still. Rear end going out?

Remove the driveshaft and reinstall it 180* difference, that may help.

Remove the driveshaft and reinstall it 180* difference, that may help.


I think it's also in the drive line. Those poly bushings you installed. In the directions, were there and torque instructions?

:secret2: A grumpy sometimes angry old man and his dog - Jake

I'll try that, I also have a spare driveshaft I can try. Also, I noticed that just by eyeballing it my rear axle seems to be a little farther forward on the passenger side. I don't know how to check if it is centered and straight though.

i had a similar problem in my car. from about 40 to 80/90 mph i could feel a bad vibration through my console and rear view mirror. then when i hit 90 i felt a whomp whomp whomp vibration through the gas pedal. so did some searching on here and it lead me to look at my driveshaft. so i took it in and the drive shaft was pretty bent. so i bought a used steel driveshaft for $100 at a salvage yard and its smooth as silk now...well kinda, i need to replace my 2 slightly bent rims.

If your rearend sits to one side more, you need to get an adjustable panhard rod

I have a double adjustable. Yeah, I'm gonna swap driveshaft with the one I have for my LS1 project and see if it goes away.