GM makes 8-speed automatic transmission standard on 2015 Chevrolet Silverado ... - Equipment World Magazine

Chevrolet and GMC have confirmed a new eight-speed automatic transmission will be standard on 2015 Chevrolet Silverado, GMC Sierra and GMC Yukon Denali/Yukon XL Denali models equipped with the 6. 2L EcoTec3 V-8. The GM-developed Hydra-Matic 8L90... 0 overall gear ratio spread is wider than GM’s six-speed automatic transmissions, providing a numerically higher first gear ratio to help drivers start off more confidently with a heavy load or when trailering. As with other EcoTec3 engines, it seamlessly switches to four-cylinder operation under lighter loads to improve fuel economy. Source: www.equipmentworld.com