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You can't use the stock shafts. I found that out the hard way from when I bought a 2 way and someone said that my shafts would work. Installed the diff and everything, put the car in gear and heard the rear end grinding.
The Nismo 2 ways are 30 spline 31mm. s13, s14, j30 stock shafts are 29 spline 30mm. I had to source s15 6 bolt 3x2 shafts for it to be a direct fit for me since I am running 6 bolt 3x2 axles. Q45 should work too, but then you will have to have the right bolt pattern axles and may have to cut the shafts.
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