The amount of lift achieved with the ACOS system and the Old Man Emu front springs worked out to be right at our 3-inch target. Different bumper and winch choices may give a final lift that is different from ours. We did run into one issue that is sure to happen in almost all instances. Rotation of the rearend pinion angle is required when installing a lift on just about any Jeep. The JK is no different. The adjustable control arms found in most lift kits today allow for easy manipulation of the pinion angle however the stock axle spring perches are welded securely in one position. If these perches are not moved or changed, the spring coils will not remain in correct alignment after the pinion angle is set. Notice in the photo how far off the ACOS piston is located with respect to the perch.