What this boils down to in parts selection is that we run the factory steering up to 2" of lift and typically start using a drop pitman arm for 2.5" - 4" of lift. Then at 6" of lift we use the raised steering arm on the knuckle. At 8" of lift you need to start thinking about crossover even for a mostly on-road truck but using the raised arm with the drop pitman will work about as good as possible. Past that, the factory system doesn't do what most guys would call an acceptable job and you really need to convert to crossover.