I was doing a Google search for "velvet ride spring shackles" and it pulled up a thread on this site where someone had posted there pics of the install of these shackles and posted his reviews. After reading that, i found LOTS of other good info and this truck being my first Ford PSD and not knowing enough about it, i decided that this was a gold mine for information on my truck. I spent several months on the Frybrid.com website which is committed to helping people properly convert there diesel engines to run on clean renewable vegitable oil as fuel. That forum page offered tons and tons of info related to that subject and I learned all i needed to from there to do my conversion and start properly using veg oil as fuel. Now I have this website to learn all the other aspecs of my motor that I am ignorant about.