re: What's the difference between Chevy and GMC?

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They're literally the exact same thing when comparing equivalent equipment groups.

The 6.2 in the Denali is the only difference.

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this is not entirely accurate, but it's pretty close. the slt gmc usually is about same as chevy ltz, denali adds a few extra bells and whistles not found in chevy (at least for tahoe/yukon - could be different for trucks).

i found that the gmc is about half a trim grade ahead of the chevy. slt gmc price wise usually sits between the lt and ltz chevy, and denali is the highest of both.