I'am weighing the pros and cons between the two. The 05 and newer trucks have a radius arm/coil spring suspension on the 4x4/ 450-550 trucks. Has anybody have had both a 99-04 Superduty with the front leaf springs and a 05-09 Superduty with the coil springs. The suspension used in the newer trucks is a flash back to 1975-1979 Ford F-150/Broncos a radius arm and coil springs. Works good and handles good just the track bar was very important to keeps the axle from going side to side. Here is the why I'am asking the old leaf springs on the front suspension makes the truck ride really rough. With 19.5 tires you have to have them absolutely balanced if not if you get a bouncy tire it shakes the whole truck. Even driving down the road you can feel every bump in the road. Hit a small pot hole and it feels like being kicked in the ribs. Is the new coil springs vast improvement in ride and handling ? I also been told that the turning radius is better I know my truck doesn't turn sharp and it has a shorter wheel base than a crew cab dually long bed. How about axle articulation ?