Judging by the "bow" in the bracing on your lower a-arm, Im thinking there has been some compression of the frame in that area. Mine was like that from the previous owner. When I replaced the a-arm, it would not fit in the mounting brackets. I had to take it to a frame shop to "pull" it back into shape. Pretty sure my front frame section is tweaked. I just live with it. The front sections of these frames are prone to bending. Weller offers a very pricey chromoly replacement front section. Good luck.
-Jeremy
-Jeremy
