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With the axle seated in the differential, we only had to slide the outer end into the upright. According to Gforce, "The strongest axle design is one that provides a constant twist for the entire length of the axle. If you make the axle larger, or the same size as the splined end, then it concentrates all the twisting loads directly into the splined area and doesn't allow it to properly twist. It would be much easier for us to make the axle the same diameter throughout, but this extra step results in a stronger piece."