Some 2013-2018 F-150/Expedition/Navigator 4x4 vehicles may exhibit an intermittent grinding noise coming from the right front or left front wheel area while accelerating in 2WD mode. Refer to the Workshop Manual (WSM), Section 308-07, Diagnosis and Testing Symptom Chart - NVH > The front axle makes noise in 2H mode only and generally under heavy throttle.
