Hy 1940 Farm Truck, if your springs are on top of your axles, then all you have to do is install raising blocks between the axle and the spring and of course get the appropriate length of "U" bolts to hold it all together again. One word of caution the axles and springs have a dowel and hole locating system to make sure everything is in its correct position, this system must be duplicated in your new raising blocks to keep everything in alignment. If your springs are under your rear axle then relocating the axle to under the springs will raise the truck, hope that helps.