I used to run a 7" long shackle w/ 56" rear springs. I now have a 6" + 3.5" double shackle off the stock shackle hanger. I made the top shackle able to bolt to the frame and so far (~3 years) I have yet to unbolt it on- or off-road. Some day I hope to fab up a trac bar and then unbolt the shackle and see what it can do.