The old long nose diff and axles won’t fit the s13 subframe. If you plan on using the s13 subframe that answers you question. That gives you all the suspension and diff options you would ever need. R200 diffs from lots of nissans will fit. It’s not easy to swap the subframe but also not impossible. It’s been done. As far as gearing, that all depends on the intended use of the Z. For Top speed go for taller gear ratio 4.08. Faster exelleration a shorter gear ratio 3.69
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