Bent spring would be a problem. I need to know a bit about wheel alighnments myself...
In a sort of related topic (sorry semi-hijack); my Sierra doesn't self centre the steering perfectly. It always goes slightly to the right (inside of road, even on a road cambered outwards). My car doesn't crab like Suzuki boy is experiencing, it just thinks turning very slightly to the right is centre (its visible with steering wheel position).
I'd like to know how to fix it, I am of the opinion that the adjuster on the tie rod just effects tow-in, is that right? That leaves nothing I can see to adjust (unless I adjust something with a grinder and welder

). Maybe steering wheel position on the spline (but its not that far out, and will only fix wheel position, not actual steering). Also could anyone think what could cause this; could it be the excessive sag of my drivers side suspension? In which case I'll probably have to live with it untill I too can buy some new suspension. Also, I have no abnormal wheel wear, slightly heavier on the front, but not side biased.
Wheeling on completely wicked angles, without even looking stable.