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Symptom Chart - NVH

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NOTE: NVH symptoms should be identified using the diagnostic tools that are available. For a list of these tools, an explanation of their uses and a glossary of common terms, refer to NOISE, VIBRATION & HARSHNESS . Since it is possible any one of multiple systems may be the cause of a symptom, it may be necessary to use a process of elimination type of diagnostic approach to pinpoint the responsible system. If this is not the causal system for the symptom, return to NOISE, VIBRATION & HARSHNESS for the next likely system and continue diagnosis.
SYMPTOM CHART - NVH

Condition Possible Sources Action
  • Transfer case whine - noise at all ranges
  • Incorrect fluid level or fluid quality
  • CHECK that the transfer case is filled to the correct level and with the specified fluid. REFER to TRANSFER CASE .
  • Worn oil pump
  • DISASSEMBLE the transfer case. CHECK the oil pump for wear or damage. REPAIR as necessary. REFER to TRANSFER CASE .
  • Under-inflated or oversized tires
  • CONFIRM that the tires and wheels are correct for the vehicle. CHECK that the tire inflation pressures are correct.
  • Transfer case growl/rumble - noise at all ranges
  • Damaged or worn bearings or planetary gear
  • DISASSEMBLE the transfer case. CHECK the bearings or planetary gear for wear or damage. REPAIR as necessary. REFER to TRANSFER CASE .
  • Transfer case scraping/grating - noise at all ranges
  • Excessively stretched drive chain hitting the case
  • DISASSEMBLE the transfer case. CHECK the drive chain for wear or damage. REPAIR as necessary. REFER to TRANSFER CASE .
  • Transfer case howl/hum - noise at all ranges or 4X4 only
  • Worn or damaged sun (input) gear, clutch pack (intermediate) gear or output shaft gear
  • DISASSEMBLE the transfer case. CHECK the gears for wear or damage. REPAIR as necessary. REFER to TRANSFER CASE .
  • Unable to duplicate customer concern
  • 4WD system and/or related components
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