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For a 4x4 that's sole purpose in life is to conquer the toughest trails in the country, we needed more axle than the stock Dana 44 or even a junkyard Dana 60 could give us - a lot more. To get there we started with a Pro-Rock Dana 60 centersection from Dynatrac. Designed specifically for off-road use, the Pro-Rock casting is contoured for maximum ground clearance, and engineered to be significantly stronger than any Dana version. Add to that the high-pinion design that not only improves ring-and-pinion strength, but also gives you a much better driveshaft angle and it's not even a fair comparison.