black99ta

iTrader: (1)

My car has developed a vibration on the highway around 75 mph. The odd thing is, some days it vibrates and some days it's smooth.

So far I have:
Changed axle bearings/seals
New tires, balanced wheels, with road force balancing
Checked axles for straightness

The car is M6, stock. Any ideas as to what could cause an intermittent vibration like this?

Thanks,

Joe

joshp14

iTrader: (5)

Driveshaft? Take it to a driveline and axle shop and have them balance it. If thats not it the only thing left is the clutch/flywheel assembly.

JD_AMG

My vibration was a bad tie rod.

joshp14

iTrader: (5)

I assume you have it narrowed down to the driveline...does it change with engine RPM or wheel RPM?

staringback05

iTrader: (8)

check the driveshaft, something ive seen before in other cars was a offset or bent rim...(99 cougar) made a thumping sound at a certain speed bc the rim was jacked up