2026 Silverado HD ZR2 Bison: Off-Road Heavy-Duty Truck

Last updated: September 21, 2026  |  Service area: Denver, Lakewood, and the Colorado Front Range

Most heavy-duty pickups make you choose. You can have a truck that tows 18,500 pounds, or you can have a truck that crawls a rocky shelf road above treeline. The Silverado HD ZR2 Bison is Chevrolet’s answer to buyers who refuse to pick one — a 2500 HD with Multimatic DSSV dampers, 35-inch mud-terrains and a set of stamped-steel American Expedition Vehicles bumpers bolted on at the factory. For Colorado owners who tow a fifth-wheel to the trailhead and then keep going, it is the most specialized truck in the Silverado HD lineup.

What the Silverado HD ZR2 Bison Actually Is

Two separate things are happening in the name. ZR2 is the trim — a full factory off-road package that sits between LTZ and High Country in price. Bison is an edition layered on top of ZR2, developed with American Expedition Vehicles, the off-road outfitter GM has partnered with since the Colorado ZR2 Bison of 2019. Both are offered exclusively as a Silverado 2500 HD Crew Cab Standard Bed 4WD, with the standard 6.6L V8 gas engine or the available Duramax 6.6L Turbo-Diesel. There is no ZR2 or Bison on a 3500 HD, a Double Cab, a Regular Cab, a long bed or in two-wheel drive.

What the ZR2 trim contributes on its own is substantial: a suspension raised approximately 1.5 inches front and rear versus other Silverado HD 4WD models, specific front control arms and steering knuckles, Multimatic DSSV dampers, a larger steel transfer case skid plate and front aluminum skid plate, a rear electronic locking differential, and 35-inch Goodyear Wrangler Territory MT tires on 18 x 9-inch aluminum wheels. Chevrolet lists the 2026 ZR2 starting at $73,200.

What the Bison Edition adds

The Bison package is not a trim sticker. Every item is structural steel or a wheel:

• Distinctive cut high-approach stamped-steel front bumper with integrated recovery points and winch provisions
• Unique stamped-steel cut rear bumper with recovery points
• Stamped-steel underbody skid plates protecting the front of the vehicle, the steering rack, the exhaust and the transfer case
• Exclusive gloss black 18-inch AEV wheels
• Unique exterior badging and the AEV logo embroidered on the front-seat head restraints

The winch provisions matter more than they sound. A bumper designed from the outset to accept a winch, with integrated recovery points rated for the load, is the difference between a recovery that goes smoothly and one that bends sheet metal — and retrofitting that to a stock HD bumper is expensive and rarely as clean.

ZR2 vs ZR2 Bison: The Numbers That Change

This is the table most shoppers actually need, because the Bison’s steel is heavy and that weight comes out of payload and gooseneck capacity. Every figure below is from Chevrolet’s published Silverado HD ZR2 and ZR2 Bison specifications.

Read that bottom row carefully if you pull a fifth-wheel. Conventional bumper-pull ratings are identical between ZR2 and Bison — 16,000 lbs on gas, 18,500 lbs on the Duramax — but gooseneck maximums drop with the Bison package, from 18,070 to 16,900 lbs on gas and from 18,100 to 15,570 lbs on the Duramax. If your trailer sits near the top of the diesel ZR2’s gooseneck rating, the Bison’s extra steel may put you over. That single number is the most common reason a Denver buyer should choose ZR2 over Bison. Payload follows the same logic: the Bison gives up roughly 383 lbs either way, and between a crew of four, a full 36-gallon tank, a gooseneck hitch and tongue weight, it runs out faster than most buyers expect.

Off-Road Geometry: Where the Bison Gains and Where It Gives Back

The Bison’s bumpers change the truck’s shape, and the approach angle is the surprise: a high-approach cut bumper is still a heavy steel bumper that hangs further forward than the ZR2 unit, and the Bison is two inches longer overall as a result.

So the Bison trades 2.7 degrees of approach angle for 0.2 inches of ground clearance and 1.4 degrees of breakover. On paper that looks like a wash; in practice it favors the Bison on the terrain Colorado owners actually see, because breakover is what saves your rocker panels cresting a rutted shelf and the skid plates underneath turn a scrape into a noise instead of a repair bill. At 82.6 inches tall and 81.9 inches wide without mirrors, though, neither truck is a narrow-trail vehicle — shelf roads above Georgetown, Guanella Pass and the routes around Buena Vista are comfortable; tight aspen-lined tracks are not the assignment.

Multimatic DSSV Dampers and Off-Road Mode

Multimatic’s spool-valve dampers use three separate spools rather than the stacked shims of a conventional shock. Shims flex; spools are machined, so damping is set by fixed passage geometry instead of a bending metal disc — far more precise control over how the damper behaves at different shaft speeds. The practical result on a heavy-duty truck is a suspension that stays composed over washboard and high-speed dirt without punishing you on I-70. The technology came out of the Colorado ZR2 racing program and was validated with Chad Hall Racing in the Best in the Desert series.

Off-Road Mode is the software half: it recalibrates the anti-lock brakes, traction control and stability control for loose surfaces, alters throttle progression and shift behavior, and removes the speed limitation on the locking rear axle — so you can leave the rear locker engaged through a sustained loose climb instead of watching for a cutoff.

Gas or Duramax? The Colorado Answer

Both engines pair with the Allison 10L1000 10-speed automatic and a 36-gallon fuel tank. The difference is in the character of the power and, at Colorado altitude, in how much of it survives the drive up.

Altitude decides this for most Front Range buyers. A naturally aspirated gas engine loses roughly three percent of its output per 1,000 feet of elevation — a rule of thumb rather than a Chevrolet specification, but a reliable one. Denver sits near 5,280 feet; the Eisenhower Tunnel is above 11,000. A turbocharger compensates for thin air in a way an atmospheric engine cannot, which is why the Duramax stays far closer to its rated output at the top of Loveland Pass.

The Duramax also makes 975 lb-ft at just 1,600 rpm, which keeps the Allison from hunting between gears on a sustained grade and keeps temperatures more manageable. If you tow heavy in the mountains more than a few times a year, the diesel earns its premium here more clearly than almost anywhere else in the country. The gas 6.6L is still the right call for a meaningful share of buyers, though: it costs less up front, carries 384 more pounds of payload in Bison form, and skips diesel exhaust fluid and the higher cost of diesel maintenance. Under about 12,000 lbs of trailer, on mostly Front Range miles, it is not a compromise.

Inside the ZR2 Bison

The cabin is the current Silverado HD interior with ZR2-specific treatment: a 13.4-inch infotainment touchscreen and a 12.3-inch reconfigurable Driver Information Center canted toward the driver, Jet Black and Graystone perforated leather with Strike Yellow accent stitching for 2026, and on Bison models the AEV logo embroidered on the front-seat head restraints. Front-seat space measures 43.03 inches of headroom and 44.53 inches of legroom.

The off-road technology worth calling out is the available 15-inch Head-Up Display with an off-road inclinometer, which puts pitch and roll in your line of sight rather than buried in a menu, plus HD Surround Vision. Across the lineup there are up to eight cameras producing as many as 14 views, including hitch view for lining up a coupler solo.

Cost, Availability and What to Expect

The ZR2 starts at $73,200, just below High Country at $73,600 and roughly $10,000 above LTZ. Bison is an available package layered on the ZR2, so a Bison-equipped truck lands above that figure and the Duramax adds more. Because option content varies and incentives change monthly, the honest answer on an out-the-door number is to price a specific truck rather than a configuration — and these are low-volume builds in a single cab-and-bed configuration, so Front Range demand moves inventory quickly.

Fuel expectations should be realistic. Heavy-duty trucks over 8,500 lbs GVWR carry no EPA fuel-economy rating, so there is no official figure for either engine. With 35-inch mud-terrains, a 1.5-inch lift and several hundred pounds of steel, the Bison is the thirstiest configuration in the lineup. The 36-gallon tank helps.

Why Buy Your Silverado HD at Emich Chevrolet

Emich Chevrolet has sold and serviced Chevy trucks on the Front Range for decades, and heavy-duty trucks are a meaningful part of what moves through our Lakewood store. That matters on something as configuration-sensitive as a ZR2 Bison, where the questions that decide the purchase are specific: what your trailer’s pin weight actually is, whether you need the gooseneck prep package, whether the Duramax pencils out for your mileage.

We will price the exact truck in front of you, show you the door-jamb payload sticker rather than a brochure figure, and tell you plainly when a standard ZR2 or an LTZ with the Z71 package fits better than a Bison. Our service department works on Duramax engines every week — and Chevrolet’s record backs the pitch, with J.D. Power naming Silverado HD America’s Most Awarded Heavy Duty Truck for Dependability across 2016 through 2025.

Silverado HD ZR2 Bison FAQs

What is the difference between the Silverado HD ZR2 and the ZR2 Bison?

ZR2 is the off-road trim: 1.5-inch factory lift, Multimatic DSSV dampers, rear electronic locking differential, aluminum front skid plate, larger transfer case skid plate and 35-inch Goodyear Wrangler Territory MT tires. The ZR2 Bison Edition builds on that with American Expedition Vehicles hardware — high-approach stamped-steel front and rear bumpers with recovery points and winch provisions, stamped-steel skid plates for the steering rack, exhaust and transfer case, exclusive 18-inch AEV wheels and AEV-branded head restraints.

How much can a 2026 Silverado HD ZR2 Bison tow?

Maximum conventional trailering is 16,000 lbs with the 6.6L V8 gas engine and 18,500 lbs with the Duramax 6.6L Turbo-Diesel V8 — identical to a standard ZR2. Fifth-wheel and gooseneck maximums are lower on Bison models at 16,900 lbs with the gas engine and 15,570 lbs with the Duramax, because the AEV steel adds weight within the same gross combination weight rating.

What is the payload of a Silverado HD ZR2 Bison?

Chevrolet publishes maximum payload of 3,013 lbs for the gas ZR2 Bison and 2,811 lbs for the Duramax ZR2 Bison. A standard ZR2 carries more: 3,397 lbs with the gas engine and 3,193 lbs with the Duramax. Always check the yellow payload label on the driver’s door jamb of the specific truck, since options and accessories reduce the figure.

Is the ZR2 Bison available on the Silverado 3500 HD?

No. Both the Silverado HD ZR2 and the ZR2 Bison are offered exclusively on the Silverado 2500 HD in the Crew Cab Standard Bed 4WD configuration. If you need higher trailering or payload than a 2500 HD provides, a 3500 HD in another trim is the right direction, but it will not be available with ZR2 or Bison off-road hardware.

Should Denver buyers choose the gas engine or the Duramax?

If you tow heavy in the mountains, choose the Duramax. A turbocharger compensates for thin air at 10,000 feet in a way a naturally aspirated engine cannot, and 975 lb-ft at 1,600 rpm keeps the Allison transmission settled on sustained grades. If your trailer is under roughly 12,000 lbs and most miles are Front Range, the 401-hp gas V8 costs less, carries more payload and avoids diesel exhaust fluid and higher service costs.

What tires does the Silverado HD ZR2 Bison come with?

Both ZR2 and ZR2 Bison run 35-inch Goodyear Wrangler Territory MT tires in LT305/70R18. The ZR2 mounts them on 18 x 9-inch aluminum wheels; the Bison uses exclusive gloss black 18-inch AEV wheels. Mud-terrain tires at this size are loud on pavement and wear faster than all-terrains, so many Colorado owners keep a second set of wheels and tires for winter commuting.

Does the ZR2 Bison come with a winch?

The Bison’s AEV front bumper includes winch provisions and integrated recovery points, but a winch itself is not part of the factory package. The value is that the bumper was engineered from the start to carry one, with mounting and recovery loads accounted for in the structure — which is substantially cleaner and stronger than retrofitting a winch mount to a standard heavy-duty bumper.

What is Off-Road Mode on the Silverado HD ZR2?

Off-Road Mode recalibrates the anti-lock brakes, traction control and stability control for loose surfaces, changes throttle progression and transmission shift points, and removes the speed limitation on the locking rear axle. It draws directly on calibration work done for the Colorado ZR2 and Silverado 1500 ZR2, and it is the single setting most worth engaging before you leave pavement.

How big is the fuel tank on a Silverado HD ZR2 Bison?

Approximately 36 gallons with either the 6.6L V8 gas engine or the Duramax 6.6L Turbo-Diesel. Heavy-duty trucks above 8,500 lbs GVWR are not required to publish EPA fuel-economy ratings, so Chevrolet does not list city or highway figures for these trucks. The Bison’s mud-terrain tires, lift and added steel make it the least efficient configuration in the Silverado HD range.

Trailering and payload figures are maximums for properly equipped vehicles and are intended for comparison purposes only. The weight of passengers, cargo, options and accessories reduces what a specific vehicle can carry or tow. Review the Trailering section of the Owner’s Manual and the label on the vehicle door jamb before towing. Pricing is manufacturer’s suggested retail price and excludes tax, title, license, dealer fees and optional equipment; dealer sets final price. Specifications subject to change.