uhhm.......straight line for me guy.........with a bit of cruising....why not airlocker...?......in my opinion too many parts to fail when you when you hit it with 400 to the wheels.......simple and strong is my opinion for a decent rear......i personally dont know any of my race friends who use a air locker or even mention of an air locker. I have had very good luck so far with an auburn posi in my car....knock on wood....it has'nt let me down yet.