Classic Truck did a nice article on the two options in last months edition. The interesting thing is that the way the leaf verses coil handle do to the mounting position of the springs. Leafs mount outside the frame thus giving a more stable ride in turns whereas the coil mount inside the frame making it have a bit more sway in the turns. I have two trucks very similar except for the rear springs and the leaf truck is much more stable in turns and can handle loads better. The coil is a softer ride. Both have overloads. I did put wide ralleys on the coil which helped a lot but still not up to the leaf. For a street rod, I would tend to go with the coil as there is more you can do with it but as a work truck, you can't beat leafs. By the way, current production is all leafs.