* The Vehicle Identification Number (VIN) Decoder: While the VIN itself doesn't *directly* contain an "axle code," decoding the VIN through Ford's website (often requires a fee) or third-party VIN decoders will reveal the specifications of your Expedition, including the axle type and ratio. This is the most reliable method.
* The Driver's Side Door Jamb: The sticker on the driver's side doorjamb usually lists key vehicle specifications. This might include the axle ratio, but it's unlikely to explicitly state the axle type (8.8" etc.).
* The Build Sheet (if available): If you have the original build sheet for your Expedition, this will contain comprehensive details about the vehicle's components, including the axle.
* Under the Vehicle: You can look under the vehicle at the differential itself, but identifying the exact axle type from this visual inspection can be difficult and requires some mechanical knowledge.
* Your Owner's Manual: While less likely to explicitly state the axle type, the owner's manual might give you some hints about the towing capacity or other information that indirectly points to the axle type.
In short, the VIN decoder is your best bet. Start there, and if you need more specific information, the other methods can help supplement what you find.
