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

A bent or dented propeller shaft

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 tires.

The universal joints are worn

Replace worn universal joints.

Burrs or gouges are on the companion flange

Excessive looseness at the slippage spine

Replace 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 propeller shaft.

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

Inspect propeller shaft for runout and missing balance weights.