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DRIVELINE VIBRATION Drive Condition Possible Cause Correction Propeller Shaft Noise 1) Undercoating or other foreign 1) Clean exterior of shaft and wash 2) Loose U-joint clamp screws. 2) Install new clamps and screws 3) Loose or bent U-joint yoke or 3) Install new yoke. 4) Incorrect driveline angularity. 4) Measure and correct driveline 5) Rear spring center bolt not in 5) Loosen spring u-bolts and seat 6) Worn U-joint bearings. 6) Install new U-joint. 7) Propeller shaft damaged or out 7) Installl new propeller shaft. 8) Broken rear spring. 8) Install new rear spring. 9) Excessive runout or unbalanced 9) Re-index propeller shaft, test, 10) Excessive drive pinion gear 10) Re-index propeller shaft and 11) Excessive axle yoke deflection. 11) Inspect and replace yoke if 12) Excessive transfer case runout. 12) Inspect and repair as necessary. Universal Joint Noise 1) Loose U-joint clamp screws. 1) Install new clamps and screws 2) Lack of lubrication. 2) Replace as U-joints as PROPELLER SHAFT BALANCE If propeller shaft is suspected of being out of balance, NOTE: Indexing propeller shaft 180° relative to the 1. Raise and support vehicle. 2. Clean all foreign material from the propeller shaft and universal joints. 3. Inspect propeller shaft for missing balance weights, broken welds and bent areas. If propeller shaft is 4. Inspect universal joints for wear and properly installed. 5. Check propeller shaft bolt torques. 6. Remove wheels and install lug nuts to retain brake rotors. 7. Mark and number the shaft six inches from the pin- ion yoke end at four positions 90° apart. 8. Run and accelerate vehicle until vibration occurs. Note the intensity and speed the vibration occurred. Stop the engine. 3 - 100 PROPELLER SHAFT DR/DH |