If you are willing to get different axles, some of the F-150s and Explorer/Mountaineers came with 8.8 inch 31 spline Traction Loc rears. They will bolt right in with the addition of 31 spline axles, and then you won't ever have to worry about snapping axles. The truck Traction Locs are supposed to have bigger springs too, for increased locking ability.