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Yes the front K.P. 60 is wider than the rear sterling. I use a stock pitman arm with 1 1/4 heim joints and DOM for my drag link and tie rod. It's cross over also. My 42's don't rub the leafs on the street only when I am wheeling. Like I said its turns almost as good as the stock T.T.B.
I didn't measure the turning radius before and after, but having just swapped in a ball joint D60 I can say it does turn tighter that the TTB. Not day and night difference, but noticeably. Yes, I also used the longer F350 pitman arm.