The only reason I was saying anything about the fox is that you can vary the N20 psi to correct for the trucks that came from the factory with the slight right pull ,you know the ones that nobody can align it out and the dealer has some stupid excuse for the truck doing it, like they told my dad... " That's built in so you if you fall asleep at the wheel you won't crossover into oncoming traffic" !!!!!! Quote from local Dodge dealer that is now out of business... .