129600N #9S. This Non Lockup Input Shaft and Hub is designed for higher HP engines. Made for Performance Dodge Diesel Applications! Shaft is made from 300 Maraging steel and heat treated to withstand high stress and torsional loads. Hub is made from 4140 heat treated stress relieved billet steel for additional durability. Precision ground at all critical diameters. Shaft to hub splines increased from O.E.M 28 splines to 35 splines to provide 25% MORE surface contact. Tested to 2,700 ft/lbs. of torque.