I used to have the big shackle lift (2.5" longer shackle, 1.25" lift) on my YJ, and aside from the vibrations this created (I know this can be cured with degree shims) the bigger problem for me was that the end of the spring was closer to the ground. This was mainly a problem in front, as it is easier to snag it on stuff. I bent a front spring when I stuffed the end of it into a rock. /wwwthreads_images/icons/crazy.gif
I now have 1" longer shackles (cut down the 2.5" longer ones in front, homemade ones in the back out of 3/8" steel plate), just to keep the rear spring off the frame when it flexes flat.
I guess it's all in what you need or like, but I find that seeing really long shackles on a Jeep is like seeing a 3" body lift... /wwwthreads_images/icons/tongue.gif
Conferr makes nice stuff though, so I don't think you can go wrong with them
Good luck
Pete
Pete
88YJ,4"susp,33"BFGMT,9kwinch,homemade swingout,258,999,4.10,weber32/36,GMHEI,one moonguy/wwwthreads_images/icons/smile.gif