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Most IDIs came with a Dana 50 front axle, except for some single cabs. I've got a single '88 F-250 with a D44 front; everything else I have is D50.
And yes, the D50 hubs are bigger than the D44.
Also, the D50s share a lot of parts with the D60s - most of the knuckle outward is the same of very close. Same basic diameters.