Chevy 4L80E High Performance 300M Billet Steel Input Shaft GM 4L80E Intermediate Shaft The 4L80 intermediate shaft is a 100% "drop-in" product made from 300 Maraging steel. Designed for high horsepower pro-street and off-road applications. For added strength and durability, the shaft is made without lubrication holes. Combine this shaft with the TCS 4L80 billet input shaft Part # 279600 made from 300M steel. The input shaft is stronger than the OEM shaft and is a necessary component for high horsepower pro-street and off-road applications.