Allen, you can't just unbolt it and slide it back and tighten it up. The spring perch has a hole in it which corresponds with the bolt head that goes through the leaf springs. This bolt head keeps the axle from sliding on the springs and prevents you from going into a severe rear-steer should you hit a major pothole.
Carl

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission