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This is a 2nd-generation 10.25-inch Sterling axle. From the outside it looks no different than either the 1st generation 10.25-inch or the 10.50-inch axle. All of the Sterlings found under the '85-and-up F-250 and F-350 pickups boast durable axleshafts with unique O-ring seals. Unfortunately, these axles also sport non-shouldered ring-gear bolts that can loosen and cause major damage.