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Also Zilla the hubs on the rear of a 939 series truck looks like the one one the left not the front hub you are showing on the right, show the rear hubs and the other side of them and we can have some useful information about the rear hubs as to if they can flip.
Okay as to flipping hubs I will say that to the best of my knowledge I would say 939, 939a1 should be able to flip have not played with a2 enough to say but can find out.