The 2027 Silverado 2500 HD pairs a 412-hp 6.6L gasoline V8 or available 555-hp 8.3L Duramax with an Allison 10-speed automatic. Reading buyers have Regular Cab, Double Cab and Crew Cab body choices, with wheelbases from 142 to 172 inches. The model overview and trim reference connect those numbers with buying choices.

Engine Specifications

The diesel’s forged crankshaft, connecting rods and steel pistons support sustained heavy-duty work. Dual-stage air-to-water charge cooling manages intake-air heat. For Schuylkill Haven owners traveling the grades along Route 61, its exhaust brake works with transmission and grade-braking strategies to manage downhill travel under load.

Exterior Dimensions: Cab, Bed and Wheelbase

Wheelbase measures the distance between the axles. Crew Cab’s two bed lengths have a 13-inch wheelbase difference, while Double Cab also has a 13-inch difference between its listed beds. A longer bed adds cargo-floor length; the cab selection determines whether the truck carries a rear seat.

Interior Seating and Cabin Layout

The WT front bench has a 40/20/40 split, and WT four-door cabs use a 60/40 folding rear bench. Available cabin displays include a 13.4-inch center touchscreen and a 12.3-inch Driver Information Center. For Lebanon households and Bally work crews, the available rear row serves a different need from an open pickup bed.

Capacity and Capability by Configuration

Maximum GVWR figures shown require the 8.3L diesel and the guide’s 18- or 20-inch wheel equipment. Payload maxima shown require the 6.6L gas engine and qualifying wheels. They describe separate configurations. Passenger weight, accessories and trailer tongue or pin weight contribute to the load carried by an individual truck.

A properly equipped Crew Cab 4WD diesel with either bed and the Max Trailering Package has a 20,000-lb maximum conventional tow rating. Gooseneck maxima are 22,400 lbs with the 6-foot-9-inch bed and 22,300 lbs with the 8-foot bed, with required equipment. The towing page lists all ten cab, bed and drive rows.

Wheels, Tires and Brakes

Rack-and-pinion electric power steering replaces hydraulic steering assistance. Tow/Haul Mode coordinates steering assistance and brake boost with engine and transmission behavior. That integration supports highway travel on I-78 and lower-speed truck maneuvering in Greater Reading without a separate hydraulic steering-fluid system.

Fuel Economy and Range

EPA fuel-economy testing excludes pickup trucks over 8,500 pounds GVWR with a bed at least 72 inches long. Silverado 2500 HD falls in this heavy-duty category, so a light-duty EPA city/highway rating is not assigned to it. Fuel use changes with trailer load, speed, terrain and engine choice; a heavy load and repeated hill climbs increase the engine’s work.

Key Features by Trim

Safety and Driver Assistance

WT’s documented safety equipment includes Automatic Emergency Braking, Forward Collision Alert, Front Pedestrian Braking, Following Distance Indicator, IntelliBeam, Lane Departure Warning and an HD Rear Vision Camera. Electronic Trailer Sway Control and Hill Start Assist are included in its stability equipment. Available trailer alerts and camera views require the appropriate additional equipment and attentive driving.

Warranty Coverage

The vehicle’s warranty booklet gives its exact engine and component coverage. Different coverage terms can apply to diesel components. Silverado HD service information connects the ownership side with condition-based oil care, brake inspections and truck maintenance at Outten Chevrolet.

What These Numbers Mean in Practice

Pottsville buyers carrying equipment can choose the 8-foot bed while retaining a Crew Cab rear row. A Reading buyer traveling to Blue Marsh Lake with passengers has the shorter Crew Cab bed choice as well. The truck and trailer together use more turning and parking space than wheelbase alone; installed hitch equipment is part of that setup.

Specifications FAQs

How much torque is available from the HD diesel?

The available Duramax 8.3L turbo-diesel V8 produces 1,230 lb-ft of torque and 555 hp. An Allison 10-speed automatic transfers that output. GM pairs the engine with exhaust braking and transmission grade-braking strategies, supporting sustained trailering work and controlled downhill travel with the required equipment.

What wheelbase does the Crew Cab use on the Silverado 2500 HD?

Crew Cab has a 159-inch wheelbase with the 6-foot-9-inch pickup bed and a 172-inch wheelbase with the 8-foot bed. Both body choices offer seating for up to six with the appropriate seat arrangement. The longer bed extends cargo-floor length and the distance between the axles.

How large are the 2027 HD front brake rotors?

The front brake rotors measure 14.6 inches in diameter, and the braking system uses four-piston fixed front calipers with electronic brake boost. Tow/Haul Mode coordinates braking behavior with steering and powertrain control. The diesel also offers exhaust braking to help manage descents while towing.

Are payload and GVWR the same specification on the Silverado 2500 HD?

No. GVWR is the maximum permitted loaded weight of the truck, while payload describes the weight the truck can carry. The GM table lists separate diesel GVWR and gas payload maxima. An accessory fitted after delivery reduces the room remaining for other carried weight; loading the truck does not raise its GVWR.

What bed sizes are listed for the 2500 HD?

The pickup bed choices are 6 feet 9 inches and 8 feet. Regular Cab uses the 8-foot bed. Double Cab and Crew Cab offer both listed lengths, with a different wheelbase for each cab-and-bed combination. The truck’s configuration determines the applicable towing and payload ratings.

Does the gas HD truck use an Allison automatic?

Yes. The gasoline-powered Silverado 2500 HD uses the Allison transmission family as well as the diesel. Its ten forward speeds support the engine across changing loads. Tow/Haul adds coordinated chassis responses, including electronic brake boost and increased steering damping, rather than working through transmission shifts alone.

Why is there no EPA city/highway MPG number on the Silverado 2500 HD?

This heavy-duty pickup falls outside the vehicle classes covered by the federal city/highway fuel-economy test. Its lack of an EPA label does not mean fuel consumption is fixed or negligible. Engine selection, road grade and trailer use all influence the fuel needed for a trip.

Explore the Silverado 2500 HD