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the thing that kills the 7.5 is not the gears or the carrier itself, it is the case. the casting is thin and can easily distort in stock form, causing the carrier to shift and pull the ring gear away from the pinion. this can be easily overcome by using a cast cover with bearing supports and welding the axle tubes to the center section.
it is in no way going to take the kind of power a 12bolt or 9inch can, but plenty of people have made pass after pass in ful weight cars without failure using a properly preped 7.5 that costs a fraction of a 12bolt.
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