![]() The gasoline engine connects to the GM six-speed automatic transmission, while the diesel engine connects to the Allison-branded GM 10-speed automatic transmission. Meanwhile, 2023 GMC Sierra HD models are available with two engines, including the naturally aspirated 6.6L V8 L8T gasoline engine and the 6.6L V8 L5P turbodiesel Duramax. Models with the 元B engine are mated to the GM eight-speed automatic, while the L84, L87 and LZ0 are mated to the GM 10-speed automatic transmission. ![]() The 2023 GMC Sierra 1500 is available with four engines, including the turbocharged 2.7L I4 元B gasoline engine, the naturally aspirated 5.3L V8 L84 gasoline engine, the naturally aspirated 6.2L V8 L87 gasoline engine and the all-new 3.0L I6 LZ0 turbodiesel Duramax engine. ![]() As a reminder, the GMC Sierra lineup can be broken down into two offerings, the Sierra LD (light duty or 1500) and the Sierra HD (heavy duty).
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