I was always under the impression that half ton 4x4's had 52" rear leaves, however, mine has 56" springs. Is this normal or unusual? Also, if unusual, is the frame a 3/4 frame or a 1/2 frame with different holes in the rear? Next dumb question. Are there any appreciable differences between 1/2 and 3/3 frames that have been confirmed? If heard people say that the frames are different thicknesses and what not but has anybody actually measured and verified?