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5.3L not available on AT4 Standard Box trim

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    • October 26, 2020 at 9:32 pm #624619
      AT4driver
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      So I found out about a month ago and have confirmed on the US and Canada GMC build sites as well as a couple dealers. The 5.3L engine is available on every Sierra and Silverado trim other then AT4 when build on a standard box. Only 3.0 Diesel and 6.2L gas is available. Anyone have any insight or have any contacts with GM? The 5.3L is GM’s most popular engine.

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