Next month, it’ll be a year since I’ve had my 2024 GMC Sierra AT4X. This one here is a 2025. Should I have waited? I’ll answer that question at the end of this video. I borrowed this truck from Jerry Seiner Buick GMC in South Jordan, Utah. Be sure to ask for Frank. Let’s go ahead and check out the window sticker so you can see the pricing on this truck.
At the very top is the description. This one has the Dungeon Storm Gray paint. Make sure to pause if you want to see the standard equipment. This is just a short listing. The base price is $83,200, and it only has three options: the Duramax engine, fifth-wheel prep, and the paint is an extra cost. The destination charge comes in at $1,995, making the total price $95,725. The 2025 models cost you $400 more than the 2024 model year.
On the front end, there is a design change, but it doesn’t jump out right away. It took me a second to notice it. Let me get closer so maybe some of you guys who love these trucks can spot it. Do you see it? I’ll just show you—right here. They added a bronze color here in 2024, but for 2025, they took that away. Other than that, there’s nothing else different on the front end. You still have the black accents, the bronze on the insert of the grille, red GMC emblem, recovery hooks, active grille shutters, parking sensors, and premium lighting on the front end.
One thing I like about the GMC AT4X over the ZR2 HD is that they don’t have a valance on the GMC trucks. I think it looks much nicer without it, and I would actually remove it if I had a ZR2 because it really completes the front-end design. This truck also has an inch and a half factory lift over the regular AT4. Here’s a quick look at the suspension. They redesigned the top and lower control arms and steering knuckle because of the extra lift. This truck features Multimatic DSSV suspension, which uses spool valves instead of deflective discs for dampening. DSSV stands for Dynamic Suspension Spool Valve.
I haven’t noticed a significant difference on the road with this suspension compared to a regular AT4 truck with Rancho shocks. I think a lot of that has to do with the truck’s weight. These trucks are still stiff, probably due to the tires. They’re Goodyear Wrangler Territory MTs, which have stiff sidewalls. These are 305/70/18s, which is about 34.8 inches tall by 12 inches wide. The load rating is the same as the 20-inch wheels, 3,750 lbs, but max PSI is 65 compared to 80.
In the wheel wells, you get fabric material. The fender flares and mud flaps have been restyled for a more aggressive look and a slightly taller ride height. I did a video recently, and I’m not sure if it will post before this one, but that truck had chrome deployable running boards. This one has black running boards, which I think looks better. Sometimes I think GM installs whatever they have available. If this were my truck and it had chrome running boards, I would have them swapped for black ones.
Here’s a closer look at the headlights, badging, and engine block heater. There’s more of that bronze color, too. You can’t black out the badges directly when ordering the truck, but there is an accessory package available. The door handles are painted, and it has a smart key system. There’s more black trimming on the mirror caps, which includes blind spot monitoring. There’s little chrome on this truck, so why would they put chrome running boards on some models? I think it might be due to availability or a factory mistake.
On the side of the bed, you have steps, and this is a 6’10” bed with a 36-gallon fuel tank. Here’s the suspension with Multimatic shocks in the rear and a five-leaf main pack with a helper spring at the bottom. They’re still using wax coating on the frame and fabric for the wheel wells. The wheel design looks good, but if I keep my truck long term, I might black them out.
Out back, it has the MultiPro tailgate with the steps. If you get a Denali Ultimate, you lose the rear bumper steps, which I would prefer to keep. This truck has a Class V hitch, camera inputs, and seven-pin connectors. They’re still using incandescent bulbs for lighting and a full-size spare tire. This is the only HD Sierra that comes with a matching spare wheel and tire, and it has a 3.42 rear end with an electronic locker.
Inside the bed, you have spray-in liner, 4- and 7-pin connectors, bed lights, a fifth-wheel prep package, and 400 watts of power. There’s also a kicker sound system, and if you like, you can add additional lights. There’s a handle to make getting in and out of the bed easier.
Here’s the color in the shade. It gets a bit darker at dusk or in shadows. As for powertrains, there’s nothing new for 2025. The 6.6L gas L8 V8 is standard with 401 horsepower and 464 lb-ft of torque. This model has the optional Duramax. They made updates in 2024, so it now has 470 horsepower and 975 lb-ft of torque. They updated the turbo and combustion system, which remains at 16:1 compression. The 10-speed Allison transmission is standard with both engines. I added Banks boost tubes to my truck for a slight performance boost, and you can find a discount code in the description if you’re interested.
Inside, the only change for 2025 is the removal of leather from the door pocket, now replaced with hard plastic. It’s a minor detail, but the leather added a touch of luxury. This interior, known as Obsidian Rush, has red and white stitching, white piping, and lots of soft-touch materials. There’s burnt wood trim and 16-way power seats with massagers. You can also adjust the bolstering and shoulder support. There’s suede on the roof and leather-wrapped grab handles.
The electronic parking brake, four-wheel drive system, and automatic drive modes are all there, including tow mode. The heads-up display is still standard, with a 12-inch and 13.4-inch screen for infotainment. This truck has heated and ventilated seats, dual climate control, and massagers. You can control the massager settings directly from the seat controls.
The screen displays a backup camera, bed view camera, and allows for various other configurations. Wireless charging is located down below, with several USB ports and a 120-volt outlet. There’s also a trailer brake control, exhaust brake, lane keep assist, parking sensors, and other features like downhill assist.
The digital screen is highly customizable. You can change the layout, add or remove items, and even configure what’s shown on the left and right sides. There’s ample information available but not as many temperature readouts as I’d like to see. The center console has storage and additional USBs.
In the back seat area, there’s plenty of storage, seat-back pockets, heated outboard seats, and more USB ports. The payload rating for this truck is 2,878 lbs, slightly more than my truck. Overall, it’s an incredible vehicle that offers both luxury and off-road capability.
Am I glad I didn’t wait for the 2025 model? Yes, I am. This truck is slightly more expensive than mine, and I’m not missing out on any features that would make it worth the additional cost.
