4 - speed transmission with overdrive mated to original 3.0 - liter engine. (barrett-jackson.com)
All are paired with six - speed transmissions for up to a 10 percent fuel economy improvement and a host of other industry - first technologies aimed at improving performance while gaining fuel economy. (jalopnik.com)
The biggest upgrade is a six - speed transmission in place of the old five - speed. (autoweek.com)