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

A bent or dented propeller shaft.

Replace the propeller shaft. Refer to One-Piece Propeller Shaft Replacement or Two-Piece 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.

The companion flange is bent or has excessive runout.

Refer to Propeller Shaft Runout Specifications in Vibration Diagnosis.

Burrs or gouges are on the companion flange.

The propeller shaft, parking brake drum, or the companion flange is unbalanced.

Incorrect rear joint angle usually as result of the angle being too large.

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. Refer to Propeller Shaft Runout Specifications or Driveline Vibration Analysis in Vibration Diagnosis.

The propeller shaft and axle flange paint marks are misaligned by more than 90 degrees.

Align the paint marks as close as possible.

DEFINITION: One hears or feels a roughness when driving the vehicle above 56 km/h (35 mph).

The tires are unbalanced or worn.

Balance or replace the tires.