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2026 GMC Sierra 3500HD
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Review and specifications

2026 GMC Sierra 3500HD

The redesigned, next-generation Sierra HD's exterior is more visually distinguished from the Sierra 1500. Aside from its roof, which is shared with the light-duty Sierra, all other visible elements are unique to the work-focused HD truck. The standard engine is a 401-hp, 6.6-liter V8 with a six-speed transmission. A 445-hp, 6.6-liter turbodiesel V8 engine with a 10-speed transmission is also available. The new truck is 10 inches longer than the previous one, which translates to more legroom. GM claims that the new HD, when properly equipped, can tow up to 35,500 pounds. Available safety features include forward collision warning, automatic emergency braking, lane departure warning, blind spot warning, and rear cross traffic warning.

Market value
$50,438
Fuel
Conventional
Transmission
Automatic
Seats
6
View listings Find dealers
Model year 2026
Owner rating Not rated
Reliability 3/5
Data updated December 4, 2025

At a glance

Model data

Overview

Powertrain
Conventional
Body style
extended cab
Drive type
4WD
Transmission
Automatic, 10-speed
Category
Full-sized pickup trucks
Generation began
2020

Pricing

Current retail median
$50,438
Retail value range
$45,550 - $57,475
Original MSRP range
$47,900 - $97,800
Trade-in range
$42,180 - $53,335

Ratings

Reliability
3/5

Road tests

Test status
Not Tested

Dimensions

Length
251 in
Width
82 in
Height
80 in
Wheelbase
159 in
Weight
7,535 lb
Maximum load
6,025 lb
Towing capacity
36,000 lb

Interior

Seating
6 people

Environmental impact

SmartWay
No

Brand context

About GMC

GMCs SUVs and trucks are versions of Chevrolets with different badges, different styling, and some extra luxury features. Overall, though, GMCs don’t often stand out, equipment-wise, from their mechanical siblings. Like many Chevrolets, GMC vehicles’ interiors are spacious and comfortable thanks to large exterior dimensions. Its SUVs range from compact models like the Terrain up to the three-row Yukon XL, which can carry up to nine passengers and their luggage—no small feat. GMC’s pickup truck line ranges from midsized models like the Canyon and the popular Sierra 1500, and goes all the way up to commercial-grade “dually” trucks with four rear wheels. The brand has also begun introducing EVs, including an all-electric pickup and the enormous, heavy Hummer EV, which is sold as either a pickup or SUV. Both used and new GMC models rank below average in Consumer Reports’ ratings for predicted reliability.

Vehicle ID: 38690 Updated: December 4, 2025

Values may vary by trim, options, location, and market conditions.

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