I have installed a 3'' Readylift leveling kit on my 2005 2WD. Mine didnt start till after the kit was installed.
I realized that there are 2 nubs, one on your lower control arm and one on your frame.(sry, dont know how to explain it)
But when stock, the 2 nubs line up and its what keeps you from over turninng. well when you install the kit, the 2 nubs no longer line up causing them to slip or grind past eachother.
Unfortunately i do not know how to fix it. If you grind them off it would cause in over steering and your steering rack could lock up so not an option.

If anyone knows how to fix it, please let me know