It won't pull your axle back, it will push it forward some. With the rc drop brackets you use the stock control arms up to 4.5in of lift. And it stays center. If you have adjustable arms already you can run the axle center or pushed forward. I run mine a little more forward then it is normally. I'm running 36s on 5.5 in of lift and have plenty of room. Best shot I have right now but will take a better one after work. And with the brackets it will flex better to.
If it ever happens to me, I'll just put the clutch down to the floor, and start revving the YJ up to about 3500 and then yell out "I'M SORRY I CAN'T HEAR YOU OVER THE SOUND OF AWESOME COMING FROM MY JEEP!"