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Air Locker

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5. We stuffed an ARB 40-spline air locker into the rear Dana 60 to make sure we had the ultimate in strength. The 40-spline Dana 60 ARB locker is very similar to the 35-spline Dana 60, but with broaching made for 40-spline axleshafts. The 40-spline axleshafts met up with the full-floating race hubs.