B4000 V6-4.0L SOHC (2005)
Driveline Angle
An incorrect driveline (pinion) angle can often be detected by the driving condition in which the vibration occurs.
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A vibration during coastdown from 72 to 56 km/h (45 to 35 mph) is often caused by an excessive U-joint angle at the axle (pinion nose
downward).
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A vibration during acceleration, from 56 to 72 km/h (35 to 45 mph) may indicate an excessive U-joint angle at the axle (pinion nose upward).
When these conditions exist, check the driveline angles.
If the tires and driveline angle are not the cause, perform the NVH tests to determine whether the concern is caused by a condition in the axle.
