Axle For 1999-2004 Mustang, 31 Spline, 5 Lug, 30.75 Inch Long USA Standard GearUSA Standard axle for 1999 2004 Mustang, 31 spline, 5 lug, 30. 75 long All USA Standard axles come with a limited 5 year warranty Put the power of performance in your vehicle in both front and rear applications Proven manufacturing technologies provide top quality products Features and Benefits: All USA Standard axles come with a limited 5 year warranty Put the power of performance in your vehicle in both front and rear applications Proven