Which trans? What is your intended purpose? I know you have other stuff posted but cannot recall the details.
The Aussie is great. But you limit yourself to the added traction only when in 4wd. Having something in the rear should be your first choice. A locker on stock 35 axles is not a good idea. 27 spline 1541H axles/locker/33 will work unless you plan on hardcore stuff. If hardcore is in the future you should consider 30 spline hardened axles. If doing up to moderate off roading, the Truetrac is a good choice in the 35 on stock axles and 33's. Add some 1541H axles for added insurance.