The last step was to reinstall the axles. These 10 1/2-inch axles are unique in that they use an O-ring on each axleshaft. This design is less likely to leak when compared to standard gaskets. Our axleshafts and O-rings were fine, so Custom Diff removed the O-rings, cleaned up the mounting surfaces, and then reinstalled the O-rings. It's also important to note that like the ring gear bolts, the axle mounting bolts are a non-shouldered design, and they can loosen over time. A good upgrade is to install shouldered bolts.