The Oem shaft went out. Went through 2 Detroit Axel replacements. I assumed that it was do to them being garbage, as they are sealed units and not lubed at all inside. Bought a rebuild kit, that is lubed during assembly. It to failed at about the same time as the others, within 3-4k miles. All seem to self destruct internally, and wearing a hole through the front and back sides (see pic). The only install one way, bolts front and back correct? Not sure where to go from here.