I have a TPI 2.5" lift on my '72 FJ40. I've had it on for several years now. I have always noticed that it rides a bit rough sometimes and that the rear end really bangs when coming off a bump on the street. Well, it seems that my rear shackles are pretty much straight up and down and the passenger side is actually pointing inward just a bit Well, I called Bob at TPI to inquire about this and after some talking he asked when I bought them and told me that they were the "first generation" of springs and they were all "short". The current generation of springs are about 2" longer!! WTF? So, I kinda want to go 4" lift but am not ready to spend the ~$700. Without doing what Woody did and relocate the hangers, what can be done? Is there some way to engineer a shackle that will work better? Has anyone else had this problem? Jody.