Just install the 2 way in the z32 diff and install that diff in your subframe. You should get spl solid differential bushings and be happy. The z diff bolts right in with the s13 diff cover installed. I've heard that the gearing in z32 and r32 diffs is great depending on what you are doing with the car. Stronger as well, pretty sure they are five bolt axles tho, dont quote me on that.
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