DEFINITION: The roughness or vibration occurs while driving the vehicle at various speeds.

A bent or dented propeller shaft or balance weight missing.

Replace the propeller shaft. Refer to Propeller Shaft Replacement.

Undercoating is on the propeller shaft.

Clean the propeller shaft.

The tires are unbalanced at 48-80 km/h (30-50 mph).

Balance or replace the tires.

The universal joints are tight.

On snap ring retainer U-joints, tap the yokes with a hammer in order to free up the U-joints. If you are unable to free up the U-joints, or if the joint feels rough, replace the joint.

The universal joints are worn.

Replace the worn universal joints.

Burrs or gouges are on the companion flange.

Excessive looseness at the slip spline.

Replace the necessary parts.

Distorted or damaged yokes or flanges.

Install new yokes or flanges.

The yokes are out of phase on two-piece propeller shaft system.

Re-index the propeller shaft.

The driveline vibration is at 80 km/h (50 mph).

Inspect the propeller shaft for runout and for missing balance weights.