Deaver will make any size lift spring you want. 4" is not the smallest. Call their shop in Santa Ana, CA and ask for Jeff Deaver. Nice and very helpful guy. Like said above, a drop pitman or raised steering arm.
Edit: To do it the right way, Jeff will want you to load down your rig with everything you carry while wheeling including a full tank of fuel and have you take your fully loaded rig to the scales and have the front and then the back of your rig weighed. They will take the weights you give them and custom make the springs to the proper spring rate for your particular setup.