Chromoly Front Axle Kit, Dana 30, 27/30 Spline, W/Super Joints USA Standard GearPrecision, quality USA Standard Gear axles. USA Standard Gear uses precision manufacturing technologies to provide top quality, competition tough axles. 30 spline inner and 27 Spline Outer Fits Dana Spicer 30 inch XJ, YJ and TJ Includes inner and outer 4340 Chromoly axles and Yukon Super Joints 5 year warranty against Manufacturer defects Features and Benefits: Fits Dana 30 front differential Includes two 27 spline, 6. 11 outer axles Includes 30