Explorer Sport Trac 2WD V6-4.0L VIN K (2007)
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loose fasteners.
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notches or visible steps or grooves created by wear.
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pitting or cracking along gear contact lines.
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scuffing or deformations.
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discolorations.
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nicks or ridges on gear teeth.
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Check backlash and carry out a ring and pinion pattern test. See: Transmission and Drivetrain/Differential Assembly/Testing and
Inspection/Component Tests and General Diagnostics/Rear Drive Axle/Differential - Ford 8.8-Inch Ring Gear/Checking Tooth Contact
Pattern and Condition of The Ring and Pinion