The wedges are call "caster wedges" and are available from several online retailers. (edit: search e-bay)
Thickest part goes in the back, the top of the kingpins lean towards the cab, bottom towards radiator.
Standard hight trucks normally use 2 degree. If its lowered you might add 1 or even 2 more degree. To little and the steering has no feel, floats around and is hard to keep straight. If you go to much, they become hard to turn at slow speeds. The weight of the truck pushing down on the axle is what returns the steering to straight ahead, by adding more caster, you tilt the axle which acts like more weight thus returning to center much quicker, but at the same time, you have to lift all that weight every time you turn a corner.
You may have to narrow them up if your springs are small width.
Joe
Last edited by cletis; 01/24/2015 4:05 AM. Reason: deleted Ebay link
