I know we've gone around on this topic a few times whether the FDII has 1" taller springs or not. Some claim they don't exist, others say they do (I'm in the group that says they do exist). Anyway, I just realized that in another thread discussing the Brake Lock Differentials, we have our answer. In this thread posted by wymtnmedic, http://www.jeeppatriot.com/forum/showpost.php?p=126998&postcount=7 the jeep engineer points out everything colored green is FDII specific and @ 3:46 in the video he addresses the taller springs which give it an extra inch of ground clearance.
Now we just need to find the actual spring codes and any FDI can now get 3 inches of lift by installing the RRO kit and the FDII springs!
Now we just need to find the actual spring codes and any FDI can now get 3 inches of lift by installing the RRO kit and the FDII springs!