My pwr steering box has crapped out and i can't decide between A-Zone and Napa. The price is about the same, but napa has a one year warranty, and A-Zone has a life time. The choice would seem to be obvious, but a lifetime warranty does me no good if i have to change them out every six months! Also, has anyone swapped out a box before? If so, how easy was it? Thanx all!!