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diff question

Does anyone know what the story is on this?  when you call modernmuscle you can't talk to dave. ( or at least i can't )  chris told me they have these in stock..https://www.modernmuscleperformance.com/product/mopar-391-getrag-lsd-differental


i asked if this is a 3.92 he says yes.. here is my concern..  


one that part number don't sow 3.91

two i was told this is the same rear end that comes in the RT cars but IS NOT A GETRAG..  well i don't want it if it isn't... anyone have any idea on how to tell or any way to contact dave himself?

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