They lure U in to thinking U have a four wheel drive vehicle when in reality U don't. These evil things lay in wait to strike when you least expect it. They will rear their ugly heads when you leave the relative safety of the paved road and turn your "4X4" into a huge boat anchor with 2 wheels spinning for traction. These evil things must be banished from your 4X4 realm and sent to the flaming pit of hell never to be seen again. Just kidding, having a little fun with these useless open differentials I had ripped out of my new and improved 4X4 Ram. Anyone need a free boat anchor?