GMC introduced the first-ever 2021 Yukon AT4 and Yukon XL with the AT4 trim level aimed right at the off-road crowd. Here’s what you need to know about the Yukon AT4. Yukon AT4 Off-Road Features: Two-speed transfer case 32-degree approach angle Skidplates for “key areas of underbody” Four-corner air suspension adds 2 inches of ground
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