larry, I remember cutting wheat with a Gleaner l3 that had developed a constant steer to one direction. You had to continually correct it. One day I tried to cut a quarter section in half by driving toward a spot on the horizon. When I got to the other end, rather than a straight line, I had a perfect curve. looked like something off a math test! As for the 1480, you'll find that setting the toe in is pretty touchy. Just a little adjustment to the rod will make a big difference. The most accurate way to do it is to jack each wheel up so that they will spin. While spinning, use a nail in a block of wood to mark a line around each tire near it's center. Use the marks to measure the toe in. When it's set correctly, it will make the machine "dart" less on the highway.