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No real debate. 10 bolts definitely started to appear in 1977, and some (very few) Dana 44s were used through 1979. It is generally accepted that the smaller internal style hubs are stronger since they drive through a spline in the hub instead of through the hub mounting bolts as with the external style.
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That is what sparks the debate..........the fact that the change took as much as 3 model years, with no real reason (as far as we consumers know anyway) for the scattering.
The bolt-on hubs were the heavy duty versions. They generally shift easier in cold weather, but in my experience the weak point is still the axle...not the hub itself.