With high horsepower engines, especially when drag racing with slicks, the left side differential output shaft on the C5 and C6 Corvettes should be replaced with the Lingenfelter heavy-duty output shaft. This heavy-duty shaft is produced from 4340 300M alloy steel to provide the strongest possible shaft design for high horsepower Corvette applications. This is a direct replacement for the left side output shaft. Also available is the right side shaft and gear set # LPE-100507. For severe duty six speed applications the LPE heavy-duty main shaft is also recommended.