front axle - from rear chassis bolt to front upper shackle mount bolt - if you pulled a string between those two points whats the distance to center of the axle.
From centerline of bolt to centerline, a straight line the bottom of the axle rests just 1/2" above that line. But mine may be a bad example as the springs have settled. Apparently there is supposed to be 2" between top of axle and bottom of bump