Video: I Wheel The All-new GMC Sierra AT4X – The Most Luxurious Off-Road Truck Money Can Buy!

Will it tackle the Diablo Drop Off?

2022 gmc sierra at4x off-road review diablo drop-off

The all-new 2022 GMC Sierra AT4X is the latest and most off-road-worthy addition to the GMC truck lineup. How off-road-worthy is it? I find out by taking it into the Anza-Borrego desert, canyons, and the Diablo drop-off. Here is how it did.

2022 GMC Sierra AT4X

The new AT4X version of the Sierra has much of the same off-road hardware that’s also underneath the new Silverado ZR2. It takes many great off-road attributes and adds a healthy dose of premium features. First, let’s start with the hardware.

Here are the latest Sierra 1500 AT4X specifications provided by GMC.

• Multimatic DSSV spool-valve dampers
• Front and rear e-locking differentials
• 18-inch wheels with 32” Goodyear Wrangler Duratrac tires
• Approach angle: 25.5 degrees
• Departure angle: 23 degrees
• Front suspension travel: 9.84 in
• Rear suspension travel: 10.62 in
• Ground clearance: 11.1 in
• Two-speed transfer case, with selectable modes, including Terrain Mode with one-pedal driving
• Unique, larger steel transfer case skid plate and available rocker protection

This is a formidable spec sheet, especially when you consider the premium off-road Multimatic DSSV shocks and the front AND rear selectable locking differentials. However, the GMC front-bumper design does not offer a great approach angle. Will it be enough to tackle some tough off-road obstacles in the Anza-Borrego desert?

The answer is – yes. The AT4X offers plenty of off-road capability to do some high-speed desert running and some mogul climbing. The truck I drove was equipped with GMC accessory rock sliders that can take some serious abuse. The smaller 32-inch tire does not offer as much cushion as a larger tire may, but the DSSV shocks provide a great level of comfort and bottom-out protection on various terrain. The dual selectable lockers and Duratrac tires provide monstrous traction. The AT4X did conquer the Diable Drop Off and was very comfortable to drive on the highway back to San Diego.

What makes the AT4X stand out are its ultra-luxurious features: heated and ventilated massaging front seats with a 16-way adjustment, an 18-speaker Bose Performance Series audio system, and premium materials throughout the cabin. It all comes at a price. The Sierra 1500 AT4X starts at $77,395 (including destination charges).

Check out the full video on the TFLoffroad Youtube channel.