Link calculator link
http://mysite.verizon.net/triaged/4linkcalcv15html/index.html It seems to work but you need to download Adobe SVG to get the graphics which you don't really need. Here is another that explains everything for you so you have a beter understanding of what it is that the first link is telling you to do.
http://www.therangerstation.com/Magazine/winter2007/4_link_tech.htm I should also add the coilover link which helps determine what size, where to place and how coilovers or coils\shocks work.
http://www.pirate4x4.com/tech/billavista/coilovers/Part_1/ this is part 1 of a two part article it has a spring rate calculator and tons of good info along with breakdowns of actual fox coilovers.
