I think all 4-pinion carriers are considered heavy duty while 2-pinions are medium. I do not think there is anything labeled as a "light-duty" limited slip carrier, rather the non-posi carriers are labeled "standard". Therefore, since ONLY 4-pins were used in nodular housings, all 4-pins are nodular and the 2.93-3.08-3.23 ratio GP while the 2-pins are the "grey iron" medium duty. However, I have seen a 55 gallon barrel of them fail regardless of being heavy duty or not over the years.
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