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What will cause a vibration that seems to be in the drivetrain when driving at 50 mph?

* Driveshaft imbalance: This can be caused by a bent driveshaft, a worn u-joint, or a loose driveshaft bolt.

* Tire imbalance: This can be caused by a tire that is out of round, a tire that has a damaged tread, or a tire that is not properly inflated.

* Wheel bearing failure: This can be caused by a worn wheel bearing, a damaged wheel bearing seal, or a lack of lubrication.

* Transmission mount failure: This can be caused by a worn transmission mount, a broken transmission mount, or a loose transmission mount bolt.

* Differential mount failure: This can be caused by a worn differential mount, a broken differential mount, or a loose differential mount bolt.