The X31 Off-Road Package is an available package for the 2026 GMC Sierra 1500 that adds equipment designed for driving beyond ordinary paved-road use, including an off-road suspension, Hill Descent Control and underbody protection.
It is a useful package for shoppers who like trims such as the Sierra 1500 Elevation but want additional factory off-road equipment.
What Comes With the 2026 Sierra 1500 X31 Package?
GMC lists the X31 Off-Road Package as including:
Capability Equipment
- Off-road suspension
- Hill Descent Control
- Underbody skid plates
Supporting Equipment
- Heavy-duty air filter
- X31 badging
These features give the Sierra a more off-road-focused equipment setup while keeping the design and feature set of the trim you selected.
Why Is Hill Descent Control Useful?
Hill Descent Control is designed to assist with maintaining a controlled descent on steep grades.
It works with the truck’s braking systems so the driver can focus on steering and positioning the vehicle through a descent. GMC also uses Hill Descent Control as standard equipment on its dedicated AT4 off-road models.
What Do the Skid Plates Do?
The X31 package includes underbody skid plates, adding protection for components underneath the truck when traveling over uneven terrain.
Combined with the off-road suspension and heavy-duty air filter, the equipment gives shoppers an additional factory-built capability option within several Sierra configurations.
X31 or Sierra AT4?
These represent two different ways to shop for an off-road-oriented Sierra.
X31 Off-Road Package
The X31 package adds off-road equipment to supported Sierra configurations.
Sierra AT4
The AT4 is its own dedicated trim with equipment such as a 2-inch factory lift, Rancho monotube shocks, a two-speed transfer case and standard Duramax power.
That means shoppers can start with the overall Sierra trim they prefer and then decide which capability features fit what they plan to do with the truck.
Finding a Sierra 1500 With the X31 Off-Road Package
Dave Sinclair Buick GMC in St. Louis can help you identify 2026 GMC Sierra 1500 trucks equipped with the X31 Off-Road Package and compare them with other Sierra configurations.
