Has anybody installed Allpro's rear spring kit? I have the kit in hand and am wondering if there is anything to watch out for. I have printed off the instructions from there web site, but still wondering what kind of problems have shone up durring install. I bought the 4" lift 56" long kit but have never done this before. I hope this kit travels as well as the sas kit that I had installed 3 years ago (this kit was installed by 4wheeler supply in Phoenix) A heads up would be great.