i am looking to do the 63" chevy spring swap on my 03' and was wondering if i could get some feedback on the positives and any negative aspects anyone has encountered. i have also heard a lot about the "double-shackle" set-up. has anyone used this setup and if so, how do you like it? also some specs on where to mount the new spring hangers would help also. i already know about the right-up on this mod that is posted on pirate-4x4 forum, but am still left unsure about a few things.