I didnt want to move with Nissan so I quit and am starting my own online magazine motoIQ.com which will launch in January or so.
I am running the NA R200 diff and crossmember which saves about 40 lbs from the TT unit. The R200 has 4.10's and is plenty strong enough for a much lighter car that won't drag race. I am going to cryo and shotpeen the internals and stub axles as well. Nissan used to use this rearend with the GTO IMSA cars which had nearly 1000 hp and they worked reliably. So I don't think I am going to have a problem with the treatment and a diff cooler.