The locating pin on the spring pack is set up for the pivoting axle mount for the torque tube on the original AD trucks. If you use the mounting kit from CPP, it has an offset hole in the spring perch to center the rear axle on the stock springs. If you rolled your own for spring perches, you have at least two choices. First, you could drill an offset hole in the perch. Second, you could turn the springs around. If you swap ends with the spring it will move the locating pin closer to the center. This requires removing the bushings from the spring eyes and swapping them. A moderate amount of work, but you needed to replace the 50 year old ones anyway.
regards,
Leon
