2024 GMC Sierra HD

The 2024 GMC Sierra HD represents the fifth model year of the fourth-generation full-size heavy-duty pickup, for which it received a mid-cycle refresh consisting of a new front end, a new interior, updates to the powertrain, and the introduction of the Sierra HD AT4X off-road model.

Quick Facts

Assembly Location	GM Flint Assembly, Michigan, USA
Type	Three-quarter ton heavy duty pickup truck (2500 HD), one-ton heavy duty pickup truck (3500 HD), one-ton heavy duty chassis cab (3500 HD CC)
Cab(s)	Regular Cab, Double Cab, Crew Cab
Bed(s)	Standard Bed or Long Bed – 2500 HD and 3500 HD; no bed – 3500 HD CC
Layout	Front-Engined, Longitudinal
Engine(s)	6.6L L8T V8 (Gasoline), Turbo 6.6 L5P V8 Duramax (Diesel)
Transmission(s)	10-Speed Auto, 10-Speed Auto Allison
Drive Wheels	Rear-Wheel-Drive, Four-Wheel-Drive
Availability	U.S.A., Canada, Mexico, Middle East
Chronology	Fifth year of fourth-generation model
Changes summary	Midcycle refresh
Predecessor	2023 GMC Sierra HD
Successor	2025 GMC Sierra HD

Changes, Updates, New Features

The 2024 GMC Sierra HD received a mid-cycle refresh along with the addition of the Denali Ultimate and AT4X trim levels.

See the complete list of 2024 GMC Sierra HD updates, changes, and new features.

The updates and changes described here are specific to the U.S. market and may differ for other markets.

Powertrain

The 2024 GMC Sierra HD introduces a more potent turbo-diesel Duramax engine, while the 6.6L V8 gasoline engine gains GM’s 10-speed transmission, replacing the six-speed used in prior model years.

Engine	Fuel	Aspiration	Transmission	Drivetrain	Horsepower @ RPM	Torque @ RPM	Axle Ratio
6.6L L8T V8	Gasoline	Atmospheric	10-Speed Automatic (MKM)	RWD or 4WD	401 @ 5200	464 @ 4000	3.73
6.6 L5P V8	Diesel	Turbocharged	10-Speed Automatic (MGM)(MGU)	RWD or 4WD	470 @ 2800	975 @ 1600	3.42

Production

Production of the 2024 GMC Sierra HD began on March 1^st, 2023 and ended on July 26^th, 2024. The trucks are produced at the GM Flint plant in Michigan.

Platform

The 2024 Sierra HD continues to ride on the heavy duty version of the GM T1 platform.

Seating

The 2024 Sierra HD is offered in three seating configurations, seating either 3, 5 or 6 passengers:

3-passenger configuration: this setup features a front split bench seat (providing seating for three)
5-passenger configuration: this setup features front bucket seats (providing seating for two), along with a 60/40 folding bench in the rear (seating three) resulting in a 2-3 configuration.
6-passenger configuration: this setup features a front split bench seat (providing seating for three), along with a 60/40 folding bench in the rear (seating three) resulting in a 3-3 configuration.