I think ratio is somewhere in the 4.3 area.
I have the front diff and rear diff and also the rear axles as those are slightly different.
it does bolt up to the subframe yes. I got a non turbo subframe on my GTR's (R33 and R34). So I don't have the rear wheel steering.
Do you want the rear driveshafts as well?
I have one set removed from a car and one set still on a car.