I've got a friend that has a Skyjacker 6" lift that fits a 05/06 Superduty. He took it off before he traded the truck in. Everything is there; it wasn't on the truck for even 6 months. He said he paid (He thinks) about $1,800.00 for it without installation. He told me he would give me a deal on it. It's been sitting at a shop for a year. He told me to make him an offer. How much would it be worth? How much should I offer?