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Theory #1: Although upgrading to alloy replacement shafts should be considered mandatory for anybody putting a locker in a Dana 35, the larger 30-spline, 1.31-inch Dana 35 shafts in Superior's Super 35 kit should minimize torsional play within the shafts, theoretically minimizing unwanted locker engagement and disengagement.Conclusion: We only ran the larger shafts, so we can't comment on the difference as compared with stock-diameter shafts.