2015 Hydra-Matic 8L90 (M5U) Eight-Speed RWD Auto Transaxle for Corvette

GM has been granted more than 24 patents related to the all-new eight-speed automatic transmission that will be offered on the new Corvette Z06. Designed and built by GM, the transmission is more than 8 pounds (4 kg) lighter and five-percent more fuel efficient than the six-speed automatic.