8.75s break teeth because the ring gear moves away from the pinion, because of flex. This has been pretty well proven and also that you CAN'T fix it. Yep, you can brace the housing, install better caps and anything else you can think of, but it will STILL flex the case itself and shear teeth. That, you can NOT stop.

A Dana does not do that simply because of sheer mass and heaviness of the case. A Ford does not do it because the pinion is supported on both ends. Other rears, 12 bolts, 10 bolts, 8.8s, Olds, etc, break for the same reason the 8.75s do........CASE FLEX. Look at it from a logical and engineering standpoint. The ring gear wants to roll, NOT go back. The REASON it tries to move back is you stack teeth and close the gap. At this point the teeth are trying to roll over themselves and the ring gear is trying to make space between itself and the pinion. It tries to push back at THIS point and breaks the cap. Yes, you can put a better cap on it, but I have also seen rears with good caps push the whole web out of the case. Something, somewhere, HAS to give unless it just knocks the teeth off clean and puts them in the bottom of the case