General Motors officially announced that Chevrolet’s and GMC’s pickup and SUV lineup will receive the brand’s latest eight-speed automatic when equipped with the General’s latest 6.2L EcoTec3 V8, not the standard 5.3L unit.
The GM-sourced and developed Hydra-Matic 8l90 is the same size and weight as the outgoing Hydra-Matic 6L80 unit with a overall wider gear spread, providing a higher first-gear ratio for a more confident start when owners are towing or hauling stuff. It also allows the engine to rev lower at highway speeds for better fuel economy.
As a refresher, GM’s 6.2L V8 is good for 420hp and 460 lb-ft of torque, allowing for a maximum tow rating of 12,000lbs.
For full details, check out the press release below.
2015 Chevrolet and GMC Pickups, SUVs to Offer Eight-Speed Transmission
DETROIT – 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 eight-speed is approximately the same size and weight as the Hydra-Matic 6L80 six-speed automatic. Its 7.0 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. The 8L90 also enables numerically lower rear axle ratios, which reduce engine rpm on the highway.
With 420 horsepower and 460 lb.-ft. of torque, the 6.2L EcoTec3 V-8 is the most powerful engine offered in any light-duty pickup, and offers a maximum available trailer rating of 12,000 pounds, based on SAE J2807 Recommended Practices. As with other EcoTec3 engines, it seamlessly switches to four-cylinder operation under lighter loads to improve fuel economy.
Additional technical details and the EPA estimated fuel economy will be announced closer to the start of production in the fourth quarter of 2014.
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