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Home >> Ford >> 2022 >> Transit Connect Titanium, Gas/Ethanol >> Repair and Diagnosis >> External Pages >> Different car >> Section 580 (Rear Drive Axle/Differential - Vehicles With: Ford 9.75 Inch Ring Gear) >> Diagnosis And Testing >> Rear Drive Axle and Differential >> Pinpoint Tests >> Pinpoint Test I: Rotational Noise From Axle That Changes Pitch When CONERING

Pinpoint Test I: Rotational Noise From Axle That Changes Pitch When CONERING

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. Normal Operation and Fault Conditions 

    All roller bearings, including those found in the rear axle, generate some noise during normal operation. Some normal noises may be perceived as severe when the vehicle is raised on a hoist and the listener is closer to the rear axle.

    Worn outer wheel bearings can produce a howl, whine, grinding, moan, or roar that change in pitch when cornering.

    Possible Sources 

    • Normal bearing noise
    • Wheel bearing worn or damaged

  2. I1 COMPARE TO LIKE UNIT

    • Compare the noise to a similar vehicle. Use an NVH analyzer or a decibel meter app to quantify the noise volume/intensity. When selecting a comparable vehicle, attempt to match:

      • axle design (8.8 in, 9.75 in, with or without ELD, etc

      • vehicle build configuration (XL, Lariat, SuperCrew, Regular Cab)

      • tire brand, size, and condition

      • vehicle mileage and condition

      • NVH analyzer sensor or decibel meter location

      • vehicle location / environment (wall or building proximity, weather or environmental conditions)

    Is the noise in the subject vehicle similar to the noise from the comparable vehicle? 

    Yes  This is a characteristic of the vehicle. Do not attempt any repairs for this condition.
    No  INSTALL a new wheel bearing. REFER to: Rear Wheel Bearing .