Question about 2006 Ford Expedition

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2006 ford expediton leaking fluid where driveshaft and rear diff mate

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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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The only place you did not mention is the pinion seal (at the yoke where the driveshaft connects) Any leak from a differential should be fairly obvious...clean everything off well and drive it, You should see seepage somewhere. Any grease on the wheels or new fluid where you cleaned will tell you where to look. If it is at the pinion seal, If you haven't done this before, don't...you can disturb the adjustment inside the gear case and damage the gears.

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