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The first of its kind in a heavy-duty truck in its class1, the all-new Allison®2 10-speed automatic transmission features closer gear spacing that allows the engine to operate in an optimal range at all times with varying load and terrain conditions. This, combined with fortified components used throughout Sierra Heavy Duty’s driveline, provides maximum torque to the wheels at all times.

1.    Comparison based on 2019 Large Pickup segment and latest competitive information available at the time of posting. Excludes other GM vehicles.
2.    Allison is a registered trademark of Allison Transmission, Inc.