I don't remember offhand if there are any markings on the housing that will tell you. Have you checked any of the numerous websites that cover the 8.8? Most of them will have a section at the beginning of the info that covers axle identification.
I used to own a Ranger Incognito (Mazda B4000) and researched this topic heavily. Besides, you want disc brakes because they're easier to service and clean/dry better when wheeling.
So if it has original disc brakes it's a 31? Cool.
As you notes, I want the disc brakes anyway.
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