Recommended for applications with forced induction engines producing over 1250 foot pounds of torque in vehicles weighing up to 4000 pounds. Will handle more torque in lighter vehicles. Input shaft is manufactured from Aermet 100 steel billet blanks, the strongest practical material available for automatic transmission shafts.The OEM forward clutch housing is bored out to 1.125" and fitted with an oversize 40 spline input shaft, vastly increasing surface area at the interface, eliminating housing failures. Exclusive design provides a positive stop for the shaft, stopping the shaft from walking out of the housing, a problem that has plagued other designs. Fully machined, splined, and ground on precision CNC equipment.