Now, how much lift do you get out of the TJ springs? How much drop do you get out of those springs, articulation I mean? I know that if it goes up too high, 38" measured from ground to center of fender, the drive shaft will tend to vibrate when speed is reduced from 70+mph. I had mine that high and had to cut the spring one full circle in order to come down to 36.5" and reduce the vibration. I used the Kia fromt springs in the rear, they ride a little harder, but I really feel good with them. Only thing I don't really like is that I don't have as much articulation as before.