What gear ratio do you have? Im going to guess a 3.54, thats what was in my first jeep with the q-trac. You already have a model 30 front, I would look for a '71-75 cj-5 or an '86 cj-7 dana 44 rear end. The older one will more than likely have a 3.73 gear, which is pretty good. I four wheeled my...