Well I finally found someone to build the conversion hangers for me to put 08+ leaf springs on a 99-07 model truck. My parts should be in tomorrow, will probably be next week before I get started. For anyone that didn't catch any of my old thread, I'll try to answer a few questions ahead of time. The main advantage of the conversion is In 2008 the F-250/350 received a longer rear spring that increased payload capacity as well as increasing the ride quality greatly. The 08+ leaf spring is 8" longer than the 99-07 leaf spring. A disadvantage of the 99-07 leaf spring is that the axle is not centered on the leaf spring. In other words, from the axle to the rear spring mount is 8" longer than it is from the axle to the front spring mounts, which adds to the axle wrap problem. The 08+ spring adds 8" to the front of the spring which puts the axle in the center of the leaf spring where it belongs.
First step will be to mount the spring hangers. They are designed to be set against the frame and use an existing bolt hole on the frame to line the hangers up correctly. Once they are lined up, its time to drill some holes. The hanger also takes into account the emergency brake cable, and is built to keep it functioning properly. I'll be posting pictures and adding to the write-up as the project progresses. In the meantime, here is a picture of what the hanger looks like. Feel free to contact me if you have any questions or need more information.