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Home >> Ford >> 2012 >> Mustang Base, 2D Coupe, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (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 2012 Ford Pickup, 2012 Ford F550 Super Duty, 2012 Ford F450 Super Duty, and 2012 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 NVH article 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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