Extreme Duty Raptor Drive Kit for 4L60E / 4L65E transmissions. This is the hot new item on the street, for high performance, towing and heavy vehicles. Twice as strong as the stock parts. Made with a new drum and shaft. Starting with a high grade of steel this shaft is hardened by electric induction. This shaft is 57% harder than a standard OE shaft. Comes with the Sonnax Input Drum Support Ring installed. LS1 RELUCTOR TYPE 4L60E.