If you have been shopping for a GMC pickup truck, particularly models from 2019 onwards, you’ve likely seen the "X31 Off-Road" badge on the fenders. But what does that code actually mean for the truck's capability?
Many customers ask this exact question. Is it just stickers and tires, or is there real mechanical substance behind the badge?
To clear up the confusion, we’re taking a close look at a 2019 GMC Sierra Elevation equipped with the X31 package to show you exactly what components make up this popular option group.
What is the X31 Off-Road Package?
Introduced with the body style redesign in 2019, the X31 package is GMC’s dedicated off-road equipment group.
It is important to note upfront: The standard X31 package does not include a suspension lift. If you are looking for a factory 2-inch lift, you need to look at the AT4 or Trail Boss trims. The X31 package is designed to add capability at standard ride height.
Here is a breakdown of the features included, using the Sierra Elevation trim as our example.
Exterior and Protection Upgrades
The exterior changes aren't just cosmetic; they add functional protection and grip.
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All-Terrain Tires: The most noticeable upgrade is the rubber. The X31 package always includes all-terrain tires. On this model, they are Goodyear Wrangler Trail Runner ATs (size 275/60R20).
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Steel Skid Plates: Underneath the front half of the truck, you get steel skid plates to protect vital components from rocks and debris.
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Carpeted Wheel Well Liners: In the rear, the package adds carpeted liners designed to dampen sound and protect the wheel well metal.
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Trim-Specific Upgrades (Elevation Model): On the Elevation trim specifically, ordering the X31 package also nets you 20-inch black wheels and chrome-tipped dual exhaust.
Suspension and Mechanical
This is where the X31 package separates itself from a base-model truck.
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Twin-Tube Rancho Shocks: You get upgraded Rancho suspension shocks. It’s important to clarify that these are twin-tube shocks. They are a significant upgrade over the standard base shocks, but they are different from the beefier mono-tube Rancho shocks found on the lifted AT4 models.
Essential Off-Road Functionality
The real value of the X31 package lies in the drivetrain enhancements that allow you to handle low-traction situations like mud, deep snow, or steep trails.
1. Two-Speed Autotrack Transfer Case (4-Low) Without the X31 package on lower trims (like a base SLE or Elevation), you might not get 4-Low gearing. The X31 ensures you have a two-speed transfer case, giving you the torque multiplication needed for serious low-speed maneuvering.
2. G80 Auto-Locking Rear Differential This is perhaps the most crucial feature. If you are stuck in mud without a locking differential, the wheel with the least resistance will just spin uselessly. The G80 locker automatically senses when one wheel is slipping and locks the rear axle together, forcing both wheels to turn and helping you pull out of sticky situations.
3. Hill Descent Control This feature allows you to set and lock in a slow speed when navigating steep downhill grades, letting the truck manage braking so you can focus on steering.
X31 vs. Z71: What’s the Difference?
Before the 2019 redesign, General Motors used the Z71 code across both Chevy and GMC brands for off-road packages.
Starting in 2019, they differentiated the branding. Chevrolet retained the Z71 badge, while GMC adopted the X31 badge. Functionally, they serve the same purpose for their respective brands.
Summary
The GMC X31 package is more than just a sticker. It is a comprehensive package that adds necessary armor, better tires, improved shocks, and crucial drivetrain technology like the locking differential and 4-Low gearing. It’s the perfect package for the weekend warrior who needs reliable capability without stepping up to a dedicated, lifted off-road trim.
Watch the full video walkthrough here: https://www.youtube.com/watch?v=S5XNDT07lcM