The price difference between the RE6130 and the RE6300 is that you get the drop brackets, braces, heavy duty track bar mount, heavy duty track bar, and swaybar relocation brackets. In the long run its saves you money if you went back and bought that stuff later on. At that kind of lift height lots of folks recommend the DB's and braces, or some sort of long arm system like the Clayton setup. When I ordered my stuff from Dirk I replaced the T-case drop with 4* shims to go with my SYE and CV driveshaft. I also went with the OME long travels and with the JKS BPE's I ended up running the ZJ rears. It seems to ride well and should only get better as things settle in and soften up. Its alot of money, but I figure I should do it right the first time and not bother with cheap fixes that just delay the inevitable.