I pulled springs and lined up upper and lower bump stops center on center at full bump. Then you'll adjust to the center wheel in wheel opening, axle side to side and square to frame and each other and Pinon angles. Once that is done it is what it is length wise on the CAs and hopefully its within tolerances. There will probably be compromises to be made. You'll get it dialed though.Currie's numbers are just a starting point. My axles did not line up with the bump stops at first. Each application has different variables. To the op make sure your bump stops are lined up and you are not hitting the track bar. I did not measure the thread length. I did un-screw them though they have a lot of thread inside the arm that I felt comfortable doing it.