Following this week’s announcement that General Motors’ new 8L90 eight-speed automatic transmission will now be used in the 2015 Cadillac Escalade, the automaker has confirmed that the transmission will also now be standard on 2015 Chevrolet Silverado, GMC Sierra and GMC Yukon Denali/Yukon XL Denali models equipped with the 6.2-liter EcoTec3 V8.
GM’s 8L90 transmission was developed for use in the 2015 Corvette Z06, but will receive small tweaks as it’s adapted for use in other vehicles in GM’s portfolio. Despite having 2 extra gears, the transmission is the same size and weight as the 6L80 six-speed it replaces.
The new eight-speed also has a 7.0 overall gear ratio, which is wider than the 6L80 six-speed, allowing for a higher first gear ratio to help drivers start more easily when towing or trailering. It also allows for a numerically lower rear axle ratio, which reduces engine RPM on the highway and saves fuel. GM says it release EPA estimated fuel economy figures for the eight-speed pickups closer to the start of production in the fourth quarter of this year.