I agree about the Z33 tranny being much weaker, several of my buddies with mildly modded Z33 are on their 2nd and 3rd transmissions. In fact one of them just had Nissan put in a Nismo transmission (if there is such a thing) but whatever it is, it is holding up better than what he had before.
We all road race together (sorry I said autocross on a previous thread) and gearingwise on the track that we run it seems to be a better ratio for this track.