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Spline Inner Outer Axle Shafts

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9. The good news is that the Super 60 uses 1 1/2-inch, 35-spline inner and outer axleshafts. Plus, if you remove the 10-lug unit bearing, you can bolt on the 8-on-170mm unit bearings from '05-and-newer F-350s. Doing so narrows the axle nearly 10 inches and allows you to use 20-inch Super Duty wheels.