AT4X is the ZR2 of the GMC lineup, although I'm not sure GMC would put it quite like that. Using the same drivetrain and suspension as the ZR2, the Sierra AT4X takes things to the next level with luxury goodies not offered in the Chevy. GMC has for a while maintained that they are the "premium truck brand" and that's finally the case in this pair where the AT4X is considerably more expensive and notably more premium than the ZR2 while being similarly capable.

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