Question about 2006 Ford Expedition
That would be your pinion seal. Sometimes a rear U-joint can throw grease rearward because the vehicle is going forward most of the time. You need to look closely.
I see from the age of your vehicle there may be Warranty coverage depending on the In-service date and mileage. There may be a Service Bulletin on this because this part usually outlasts the vehicle.
Try giving your Vin# to a Ford dealer and see if they will help.
Posted on Jun 06, 2010
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Posted on Jan 02, 2017
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