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Gmc At4 2020. The front end for the 2020 GMC Sierra is a great look without being polarizing. In 2020 the company made the following changes.
2021 GMC Sierra AT4 Engines When it comes to the engine lineup things are about to remain the same. Standard on SLE Elevation SLT AT4 and Denali. 16 City 21 Highway.
Starting at price for 2020 Yukon SLE.
Standard on SLE Elevation SLT AT4 and Denali. More for exclusivity than actual improvement aside from the off-road suspension the AT4 adds a two-inch suspension lift and hill descent control as well as front. 2020 GMC Sierra 1500 AT4 Specs. I just bought a 2021 AT4 the other day.