Chevy 4L80E High Performance 300M Billet Steel Input Shaft GM 4L80E Input Shaft This billet input shaft is a 100% "drop-in" replacement for the O.E.M.shaft. Made from 300M steel, this shaft is vastly stronger than the OEM shaft and, is a must have component for high horsepower pro-street and off-road applications. Don't be fooled by those offering O.E.M. shafts that have been hardened and put back into service!