Ghost I am not 100 % sure of the spring shakles but the front axle for 1928 to 1940 has the same dimentions as each other with 50-1/2 inches kingpin to kingpin and 26-3/4 inch spring center to spring center springs being 1-3/4 inches wide this would f=be for trucki and car so if one was going to change to a wider spring and less springs in the pack say to 2-3/4 inches wide One would have to make the shackles on the frame to compensate for the wider springs. vette59jdwl