SilvrSRT10 said:D, If your still running the stock Pirelli's, get rid of them. You'll be amazed at how much better the truck drives with any other brand of tire. Day and night difference. Once you do that and still feel you need a handling kit then pursue it. But ya gotta start where the rubber meets the road.
Big Dave is correct.
I have mentioned this before that the Pirelli's are a square shouldered tire and they do tend to move around a bunch. I have also found that they are very sensitive to tire pressures. Two or three PSI either side of the sweet spot and they are a bitch.