I guess if your getting a whole new center section and axles its a no brainer to go 35 spline. I've read bad things about true tracs but maybe the 9" one is stronger. Did you do the blazeland kit in the front? I think I have a rancho centerlink which I remember being beefier but I haven't had a chance to compare it to stock yet. I don't think I'm going to use it is that anything you would be interested in?