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Old post but since someone just reached out over PM to ask me for advice about this very swap, I'll post here what I wrote them for others who find this post through search: I ended up installing the Datsun flange on the Subaru diff with an impact, just ratcheted it on. Bad idea. You need to find a better way to do it so you don't end up screwing up the input bearing on your diff. Mine started whining more and more after a while, and while I can't be sure that the way I installed the input flange is the cause, it is the most likely cause. I would take the extra time to do it right next time. How I would do this next time: get a long piece of L-channel steel from the hardware store, and drill two holes in it so you can bolt it to the input flange and hold it in place. With the diff on the ground and the L-channel bar as a means to stop the flange from spinning, use your torque wrench to tighten the nut to the exact torque spec (136 lb/ft). You can probably make this easiest for yourself if you lay the diff on the ground with the front support, and putting the L-channel piece to your right when looking at the diff. Now all you need to do to stop the flange from spinning while tightening the nut is hold the diff on the ground (perhaps get a buddy to hold it down).