Very good information on the caster, I have 4 degrees in mine due to tire size and how the springs set. I had to adjust the draglink when I changed front and rear springs, just the hight different pulled the steering box off center. Anytime the front axle is moved, either up or down or forward / backwards, the draglink to pitman arm length changes. Any change in this length will move the steering off center, some more then others. You can tolerate some, but too much will cause issues.
