For the new model year, which starts production in the fourth quarter this year, the vehicles with a 6.2-liter EcoTec3 V-8 engine will now have a longitudinal Hydra-Matic 8L90 eight-speed automatic transmission that comes standard. The new transmission is about the same size and weight as the one it's replacing and will provide a higher first gear to help with heavy loads and towing as well as enabling lower rear axle ratios to reduce engine RPMs at highway speeds.
The 2015 vehicles receiving the new transmission will include the Chevrolet Silverado, GMC Sierra, Yukon Denali and Yukon XL Denali.
Learn more about these and other improvements at Jim Butler Chevrolet, St. Louis' number one Chevy dealer.