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Upgrade the axles in your 1979-1993 Mustang with this 31 spline, 4 lug axle kit! If you're upgrading to a 31 spline differential, these axles are the perfect pair! These axles are stock length, 31 spline, with a 4" x 4.25" bolt pattern. Each axle is constructed from a high-quality steel, and then hardened, to increase torque capacity 25% over your stock axles! Included in this kit is one pair of 31 spline, 4 lug rear axles.