GM confirms 8-speed automatic transmission for Silverado and Sierra

Following last week’s rumours, GM has confirmed the Chevy Silverado and GMC Sierra, as well as its full-size SUV variants, will receive an eight-speed automatic transmission.

GM says the new transmission is similar in size and weight to the outgoing Hydra-Matic 6L80 six-speed gearbox, and has tweaked it with wider gear ratios, which translates to more available torque in first gear. In addition, the additional cogs will allow for a lower rear axle ratio figure, which will translate to lower RPMs on the highway. That, as we all know, leads to improved fuel economy, although GM hasn’t offered any official numbers.

The eight-speed automatic will only be available on Silverado and Sierra pickups equipped with the 6.2-litre V8. Trucks powered by the 5.3-litre V8 and the base 4.3-litre V6 continue to make do with the six-speed automatic. The Chevy Tahoe and Suburban, GMC Yukon and Cadillac Escalade all continue with the six-speed automatic as well.

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