For 1990-2009 cars

### First-Order Driveline Vibration Symptoms

The following symptoms may indicate first-order driveline vibration:

• | The vibration is related to vehicle speed.

• | The vibration is torque sensitive.

• | A boom or moan noise is present.

• | The vibration occurs commonly above 72 km/h (45 mph), but possibly at speeds as low as 48 km/h (30 mph).

• | The roughness or buzz vibration is felt in the seat, the floor or the steering wheel.

• | The corresponding frequency on the EVA equals first-order driveline rotation (25-60 Hz), depending on the speed of the vehicle and the ratio of the axle. Refer to Matching Frequency to Component RPM in order to obtain the rotation speed of the propeller shaft.