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Pinpoint Test L: Howl- Can Occur At Various Speeds And Driving Conditions (Affected By Acceleration And Deceleration)

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 

    REFER to: Front Drive Axle and Differential .

    Possible Sources 

    • Incorrect ring and pinion contact
    • Bearing preload
    • Gear damage

  2. L1 INSPECT RING AND PINION, BEARING PRELOAD AND FOR GEAR DAMAGE

    • Inspect ring and pinion, bearing preload and for gear damage.

    Was ring and pinion or bearing preload out of specification? 

    Yes  Adjust as necessary. REFER to: Removal and Installation Differential Carrier . REFER to: Disassembly and Assembly Differential Carrier . REFER to: Removal and Installation Differential Ring Gear and Pinion .
    No  Inspect the vehicle for any other symptoms related to the axle.
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