[MudderChuck]

Wire brush and oil all the threads you can see. When taking the nut off, if it comes hard after the first half turn or so, feel the nut with your finger, if they come off really hard they heat up and can strip the threads.
Your vehicle is fairly new. But with the tires removed, with an inch pound torque wrench, turn the big nut on the pinion yoke (record the reading, remember the feel). After you get it all torgether, check it with the inch pound torque wrench again. If things tighten up much, it can cause overheating of the bearings. [addsig]