Almost forgot.... Friday afternoon, i stopped by friend's salvage yard to look around and I stumbled upon a rear cradle out of a 350z. It was a 3.5x gear ratio I believe and also was a Viscous LSD version. Pulled the cover and the ring and pinion looks really good and I don't see a problem using it. Also it had 2k miles on it.
the pic doesn't do the rear diff any justice, the axles are huge compared to my stock ones, I'll do a side by side photo. Also Im working with the Drive shaft shop and a local business to see come up with a hub solution / custom cv axle setup to hold up to my power goal.