PROPELLER SHAFT


PROPELLER SHAFT VIBRATION


DRIVELINE VIBRATION

Drive Condition
  		Possible Cause
  		Correction
  
Propeller Shaft Noise
  		1. Undercoating or other foreign material on shaft.
  		1. Clean exterior of shaft and wash with solvent.
  
2. Loose U-joint clamp screws.
  		2. Install new clamps and screws and tighten to proper torque.
  		  
3. Loose or bent U-joint yoke or excessive runout.
  		3. Install new yoke.
  		  
4. Incorrect driveline angularity.
  		4. Measure and correct driveline angles.
  		  
5. Worn joint.
  		5. Install new joint.
  		  
6. Propeller shaft damaged or out of balance.
  		6. Installl new propeller shaft.
  		  
7. Broken rear spring.
  		7. Install new rear spring.
  		  
8. Excessive runout or unbalanced condition.
  		8. Re-index propeller shaft, test, and evaluate.
  		  
9. Excessive drive pinion gear shaft runout.
  		9. Re-index propeller shaft and evaluate.
  		  
10. Excessive axle yoke deflection.
  		10. Inspect and replace yoke if necessary.
  		  
11. Excessive transfer case runout.
  		11. Inspect and repair as necessary.
  		  
U-Joint Noise
  		1. Loose U-joint clamp screws.
  		1. Install new clamps and screws and tighten to proper torque.
  
2. Lack of lubrication.
  		2. Replace joints as necessary.
  		  

Out-of-round tire or wheels that are out of balance, will cause a low frequency vibration.

Brake rotors that are unbalanced will cause a harsh, low frequency vibration.

Driveline vibration can be caused by loose or damaged engine mounts.

Propeller shaft vibration increases with vehicle speed. A vibration that occurs at a specific speed is not usually caused by a out of balance propeller shaft. Worn universal joints or an incorrect propeller shaft angle, can cause such a vibration.


BALANCE



NOTE: Indexing the propeller shaft 180° relative to the yoke may eliminate some vibrations.




NOTE: If the propeller shaft is bent, it must be replaced.

















RUNOUT


RUNOUT SPECIFICATIONS

Front of Shaft
  		0.020 in. (0.50 mm)
  
Center of Shaft
  		0.025 in. (0.63 mm)
  
Rear of Shaft
  		0.020 in. (0.50 mm)
  

NOTE: Measure front/rear runout approximately 3 inches (76 mm) from the weld seam at each end of the shaft tube for tube lengths over 30 inches. For tube lengths under 30 inches, the maximum allowed runout is 0.020 in. (0.50 mm) for the full length of the tube.