TH-350 Input Shaft and Drum. This 2nd Generation Drum & Input Shaft is designed for OFF-ROAD RACING and EXTREME DUTY applications. Input shaft is made from 300M steel. Weighs 6.79 lbs. versus 8.23 lbs. O.E.M. Drum is made from 4140 heat treated / stress relieved billet steel. Assembly is a 100% drop-in product. No modifications necessary.