The Chevrolet Performance SuperMatic 10L90-E Transmissions 19420480 is a new 10-speed automatic transmission kit designed for compatible Chevrolet Performance LT crate engine applications, including LT1, LT4, and LT5 builds. Built with modern electro/hydraulic controls, clutch-to-clutch shifting, a 4.70:1 first gear ratio, 7.39:1 overall gear ratio spread, three overdrive gears, and a 650 lb.-ft. output torque rating, this kit is a strong choice for performance builders, restoration shops, custom vehicle builders, mechanics, and drivetrain specialists who need a modern SuperMatic automatic transmission package.