Some guys remove some material from the front axle. Like this -
http://rctruckandconstruction.com/sh...light=steering
Some guys re-do the steering links to improve the geometery a bit. Like this -
http://rctruckandconstruction.com/sh...light=steering
Some also remove some material from the knuckles, though it weakens the knuckle too. Just a couple ways to do things.