28 or 31 spline axles?
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As the splie count increases, the phyisical diameter of the axle increases. The more splines the thicker and stronger the axle becomes. It also weighs a little more. You can gun drill to reduce the weight and still get the extra strength.
I would go 31 spline. It will be a stronger part and handle more HP. Above 31 spline and the diff choices start to get limited.
I would go 31 spline. It will be a stronger part and handle more HP. Above 31 spline and the diff choices start to get limited.