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Home >> Ford >> 2003 >> Cutaway 7.3 F >> Repair and Diagnosis >> External Pages >> Different car >> Section 2611 (Four Wheel Drive (4WD) Systems -- F250-F550 Super Duty) >> Diagnosis And Testing >> Four Wheel Drive (4WD) Systems - Mechanical Shift >> Symptom Chart - NVH

Symptom Chart - NVH

WARNING: This page is about a different car, the 2011 Ford Pickup, 2011 Ford F550 Super Duty, 2011 Ford F450 Super Duty, and 2011 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
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 Section 100-04  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
  • CARRY OUT the Manual Shift-On-Stop (MSOS) Functional Test. GO to PINPOINT TEST F .
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