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Housing the ring-and-pinion, carrier, and bearings, the centersection is the heart of every drop-out-style axle. Since our junkyard housing didn't come with one, we gave the differential experts over at West Coast Differentials a call and had them build one of their drop-in assemblies to our specs. With plans for 37-inch tires and various terrains in the future, we went with an always dependable Detroit locker and 5.13 gears to make sure we didn't lose any power through our 31-spline factory shafts.