You can lower it by de-arching, as you suggested. But I have no experience with that.
Other methods people have tried are to flip the springs and run them upside down, or remove some leaves from the stack so you get more sag.
My '59 Apache came with leaves removed and the frame would crash the axles over the most minor of bumps. I actually use the truck, so this was no good.
I finally bought some Posie springs for it. They claim to be about 3" lower than stock. Truck now has nice balance between looking good (low) and actually being useful.
Jason
Last edited by JasonMcElroy; 09/12/2014 5:13 PM.