The AR is just a simple torsion bar that twists. The more leverage on the bar, the softer its effective rate. The further away the links attach to the bar arms, the more leverage is imparted on the bar and, therefore, the softer the rate is. The softer the rate, the less it will counter body roll. There are 5 holes on the arm bars that come with the basic TJ kit.
For anyone that doesn't have a clue how this stuff works, it's absurdly simple. Go watch the video on Currie's website, go look at pictures, and apply what you learned back in high school physics. It should all click just fine.