![]() ![]() ![]() A wider 7.0 overall gear ratio spread provides a numerically higher 4.56 first gear ratio, helping drivers start off more confidently with a heavy load or when trailering. With four simple gearsets for optimal efficiency and five clutches (two brake clutches and three rotating clutches), creative packaging enables the new eight-speed automatic to fit the same space as the previous six-speed automatic, with a lower weight. “It is a marvel of packaging efficiency and driving efficiency that has garnered more than two dozen patents for General Motors.” “The new 8L90 eight-speed is designed tougher to handle the greater power of the Silverado’s powertrains, with great improvements in spin loss to complement that capability with greater efficiency,” said Kavoos Kaveh, global chief engineer for eight-speed automatic transmissions. ![]() It was designed with 11 percent greater torque capacity than GM’s 6L80 six-speed automatic transmission, complementing the output of the 6.2L, which – at 420 horsepower and 460 lb-ft of torque – is the most powerful engine offered in a light-duty pickup.ĮPA estimated fuel economy will be announced closer to the start of production in the fourth quarter of 2014. ![]() DETROIT – The all-new, GM-developed Hydra-Matic 8L90 eight-speed transmission is matched with the available 6.2L EcoTec3 V-8 engine in the 2015 Chevrolet Silverado 1500, supporting the pickup’s capabilities with greater efficiency and refinement. ![]()
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