Yesterday I put smaller wheels and tires on my truck. I got to looking at the rear leaf springs. I THOUGHT it was just the rear leaf spring pack with a 5" lift block. Heres what I'm seeing. I have a 5" block, then my factory block, then a single leaf spring, then a leaf spring "pack" (3 leaf springs inside clamps), then what looks like a 1-2 inch block, then another single spring. What am I looking at here? Is the factory just the 3 springs inside the clamps??? Are the other 2 single springs and that little block in between the springs just for more lift??? It's on a 99 F-350. Thanks for the help.