the bearing design of the front versus the rear are different.
the rear two bearings inner races are held apart by a solid sleeve and thus the nut torquing is to clamp the two races to the sleeve. the inner and outer race are held together by the roller elements and the torquing has NO effect on the "loading" of the two bearings
the front two bearings are tappered design and the inner and out race have to be held together by the torquing of the nut. If the nut is over torqued even the slightest amount too much, it will over load the bearings
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