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Spline Axle Shaft

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Depending on what decade you get your 9-inch axle from, you will either have 28- or 31-spline axleshafts. The later fullsize trucks and Broncos will all be a bit wider than the earlier versions (closer to 62 inches), and should have the stronger 31-spline shafts. There are a few variations in the housing itself, but this will not affect the centersection.