I feel like a lot of these decisions you make when building a car are really strongly influenced by what you might already have, what used stuff you can find locally, etc. I mean if i have an 8.5 or 12 bolt in my shed or I find a decent price on craigslist, I'm not dropping 3 grand on a brand new 9 inch or dana 60 if am building a 500 hp car. But if I'm going to buy a brand new rear assembly anyway, I have a hard time seeing why I'd go with anything other than a 9 or a 60.
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