GMC AT4X AEV vs Chevy ZR2 Bison: Rare GM Diesel Trucks at Mark Martin Motors

If you are hunting for the absolute pinnacle of heavy-duty off-road capability, you have probably narrowed your search down to General Motors. Right now at Mark Martin Motors in Ephrata, PA, we happen to have two of the rarest trucks on the market parked side by side. We are talking about the GMC Sierra 2500 AT4X AEV edition and the Chevy Silverado 2500 ZR2 Bison.

Both of these heavy-duty haulers are powered by the legendary Duramax diesel engine paired with the Allison-branded transmission. They represent the top-of-the-line off-road packages from GM, but deciding which one deserves a spot in your driveway comes down to a few key differences in styling, features, and price.

Two Top-Tier Off-Road Beasts Arrive in Ephrata PA

Whether you are driving over from Philadelphia, Maryland, New York, or anywhere within a four-hour radius of our dealership at 4126 Oregon Pike, you will find that these trucks are worth the trip. GM teamed up with American Expedition Vehicles to build out these off-road packages, and the results are incredible.

Shared Bones and Unmatched Suspension

Underneath the sheet metal, these trucks share the exact same off-road capabilities. When you climb under either the AT4X AEV or the ZR2 Bison, you will find:

• Front and rear steel bumpers stamped by AEV.

• Stamped skid plates protecting the underbelly.

• 35-inch factory tires.

• Multimatic DSSV shocks, identifiable by their blue and yellow coloring, which offer the absolute best factory suspension you can get in a 2500 truck.

• Front and rear locking differentials for maximum traction.

Exterior and Tailgate Differences You Should Know

While they share the same bones, looking at them from the outside reveals some distinct styling choices. The GMC features exclusive AEV carbon flash wheels and lights integrated into its fender flares. The Chevy lacks the fender lights and features a different hood scoop and air intake design.

When you move to the back of the trucks, you will spot a few more differences. The ZR2 Bison originally comes with a black wrap on the top half of the tailgate, though some owners choose to peel it off. More importantly, the GMC features a Kicker Bluetooth sound system built directly into its drop-down tailgate, a feature you typically will not find on the Chevy ZR2. Finally, the GMC AT4X comes standard with power running boards, whereas they do not come standard on the ZR2 Bison.

Interior Vibes: Sporty Chevy vs Refined GMC

The interior is where the spread between these two trucks really becomes obvious.

The Chevy ZR2 Bison leans heavily into a rugged, sporty feel. You get a Bose seven-speaker sound system, a unique center console layout with great open space, and heavily bolstered seats that really hug you. The styling features gray and black materials with bright yellow stitching, complete with AEV logos on the headrests and all-weather AEV branded floor mats. It feels like a truck built for a driver who isn't afraid to get it scratched.

Step into the GMC AT4X, and the atmosphere changes to pure luxury. It boasts a 12-speaker Bose audio upgrade, a suede headliner, and full-grain leather seats. These seats are completely different from the Chevy, offering adjustable upper back and side lumbar support, plus massaging functions. The color palette is more subdued with white, black, and red stitching. Many people find the GMC to be the more polished and refined option of the two.

The Price Difference: Is the AT4X Worth It?

This is the ultimate question for buyers. A brand new Chevy ZR2 Bison has an MSRP around $93,800, while a fully built-out GMC AT4X AEV stickers closer to $107,400. That is a massive price spread for trucks that share the same engine, transmission, and suspension.

In the used market, this price gap creates huge value opportunities. For example, we recently got a slightly used 2026 Chevy ZR2 Bison with only 8,000 miles. While it would cost you almost $94,000 brand new, we have it listed on our website right now for $81,500. When you are comparing that to an AT4X that might run you $85,000 even on the used market, you have to decide if the extra massaging seats and tailgate speakers are worth the premium.

Why Truck Buyers Drive to Ephrata

We love doing these deep-dive comparisons every week because we get the most unique trucks in the country rolling through our lot. If you are anywhere in the mid-Atlantic and willing to take a short drive up to Lancaster County, we can put you behind the wheel of your dream diesel.

Check out the full comparison in our latest video below, and be sure to visit markmotors.com to see what is currently in stock.

Watch the full breakdown here: https://www.youtube.com/watch?v=ZerZKw7CrEw