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the case deflects and distorts. that is how the ring runs away from teh pinion gear and shreds the teeth. the ring gear could be a foot thick and ten feet around and it wouldn't make a difference, because once the case starts distorting, only a fraction of the teeth are making contact.
for a daily driver like this application, a little beefing up of the housing and a set of 3.73 or 4.10 gears will be fine.
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