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2015 Chevrolet/GMC Trucks, SUVs With 6.2L V-8 Get Standard 8-Speed

Motor Trend logo Motor Trend 7/18/2014 Alex Nishimoto
2014 Chevrolet Silverado Z71© Provided by MotorTrend 2014 Chevrolet Silverado Z71

The longitudinal Hydra-Matic 8L90 eight-speed automatic transmission that debuted in the Cadillac CTS VSport found its way into the Corvette Z06 and standard 2015 Corvette Stingray as an option earlier this year. As you might expect, GM is rolling out that transmission in other models, announcing today that Chevy and GMC trucks and SUVs equipped with the 6.2-liter EcoTec3 V-8 will get the eight-speed as standard for 2015.

2015 Chevrolet Corvette Z06 Eight Speed Automatic Transmission© Provided by MotorTrend 2015 Chevrolet Corvette Z06 Eight Speed Automatic Transmission

The new GM-developed transmission is approximately the same size and weight as the outgoing 6L80 six-speed auto, the automaker says. The eight-speed has a 7.0 overall gear ratio spread, which is wider than the six-speed's to provide a higher first gear to help with heavy loads and towing. The new transmission also enables lower rear axle ratios to reduce engine rpms at highway speeds.

The eight-speed automatic will come standard on the 2015 Chevrolet Silverado, GMC Sierra, Yukon Denali, and Yukon XL Denali models equipped with the 6.2-liter V-8. That engine is rated at 420 hp and 460 lb-ft of torque, and contributes to a max trailer rating of 12,000 pounds. Like the other EcoTec3 engines, the 6.2-liter cuts four cylinders under lighter loads to improve fuel economy.

Official EPA estimates haven't been announced yet, but expect mpgs to increase compared to the outgoing six-speed. Production for 2015 Chevrolet and GMC trucks and SUVs starts the fourth quarter of this year.

Source: GM

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