Transfer Case Whine or Rumble Noise
Transfer Case Whine or Rumble Noise
| Cause |
Correction |
| DEFINITION: A faulty internal transfer case component that causes a high pitch whine or low pitch rumbling noise in the transfer case. A high pitch whine or rumble noise with the vehicle in 4LO is to be considered normal. Heavy duty NQH transfer case applications are noisier by design in 4WD mode than are lighter duty applications. Compare the noise to a similar vehicle to see if a normal condition. 1. Identify the source of the noise using chassis ears and refer to the appropriate service manual section. 2. Note specifics such as when the noise is present (2HI, 4HI, OR 4LO). 3. Note if the noise relative to vehicle speed, is noisy on turns, or other specifics. 4. If the source of the noise is the transfer case, inspect for the correct fluid level. 5. Inspect the drain plug for large metal deposits. Small metal flakes and fine metal dust on the plug magnet are to be considered normal. Review the Symptoms - Transfer Case and perform the necessary inspections. |
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| TIRE NOISE |
Note: A high pitch whine or low pitch rumble noise that increases as vehicle speed increases may be caused by tires that are, unevenly inflated, unevenly worn or have an aggressive tread pattern. Rotate or substitute tires and retest. Tire and Wheel Inspection |
| Propeller shaft center support bearing worn (as applicable) |
Note: A high pitch whine or low pitch rumble noise that increases as vehicle speed increases may be caused by a worn center support bearing. Replace the center support bearing as required. Symptoms - Propeller Shaft |
| Propeller shaft universal joints worn |
Note: A high pitch whine or low pitch rumble noise that increases as vehicle speed increases may be caused by worn universal joints. Replace the universal joints as required. Symptoms - Propeller Shaft |
| Front or rear axle bearings worn |
Note: A high pitch whine or low pitch rumble noise that increases as vehicle speed increase may be caused by worn axle bearings. To determine if the noise is front axle related, remove the front propeller shaft and retest. Repair or replace the axle as required. Symptoms - Front Drive Axle or Symptoms - Rear Drive Axle |
| Cause |
Correction |
| Transmission rear output shaft bearing worn |
Note: A high pitch whine or low pitch rumble noise that increases as transmission output shaft speed increases may be caused by a worn transmission output shaft bearing. Repair or replace the transmission as required. Symptoms - Automatic Transmission |
| Transfer case fluid level low |
Note: A high pitch whine or low pitch rumble noise that increases as transmission output shaft speed increases may be caused by a low transfer case fluid level. Fill the transfer case to the correct fluid level and retest. |
| Transfer case input shaft bearing worn |
Note: A high pitch whine or low pitch rumble noise that increases as transmission output shaft speed increases may be caused by a worn transfer case input shaft bearing. Replace the bearing as required. Transfer Case Disassemble and Transfer Case Assemble |
| Transfer case front or rear output shaft bearings worn |
Note: A high pitch whine or low pitch rumble noise that increases with road speed may be caused by the front or rear output shaft bearing. Replace the bearings as required. Transfer Case Disassemble and Transfer Case Assemble |