My car was riding super smooth until I needed a new clutch at about 80K. After the clutch got changed I also got what was more of a hum or slight vibration between 60-80mph. The clutch, flywheel and transmission suspension was replaced. The balance was checked on the tires (not road force) but I highly doubt it's the tires since the car was extremely smooth until that service. One mechanic that knows my car says he can tell the difference before and after but he has no idea what could be causing it.
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