The 2018 GMC Sierra HD line of heavy-duty full-size pickup trucks – including the 2018 Sierra 2500HD and 2018 Sierra 3500HD – receives several minor updates and changes for the 2018 model year.
2018 Sierra 2500HD Changes, Updates & New Features
The 2018 Sierra 2500HD sees the following changes, updates and new features:
- Deletion of three exterior colors
- Addition of two exterior colors
- Addition of Rear Vision Camera as standard equipment on all models (was available on 1SA/base on 2017 Sierra), resulting in the removal of the Rear Vision Camera from the Sierra Convenience Package and Sierra Convenience Plus Package
- Replacement of base 4-speaker audio system with 6-speaker sound system on 1SA (base)Â Regular Cab models
- Replacement of base AM/FM stereo with 4.2-inch diagonal color display with GMC Infotainment System Radio with 7″ diagonal color touch-screen (IOB) as standard equipment on 1SA/base models
- Addition of Tire Fill Alert in Tire Pressure Monitoring system
- Addition of new content to the All Terrain HD Package
See detailed 2018 GMC Sierra 2500HD changes, updates and new features here: 2021 GMC Sierra 2500HD change log.
The updates and changes described here are specific to the U.S. market and may differ for other markets.
2018 Sierra 3500HD Changes, Updates & New Features
The 2018 Sierra 3500HD sees the following changes, updates and new features:
- Deletion of three exterior colors
- Addition of two exterior colors
- Addition of Rear Vision Camera as standard equipment on all models (was available on 1SA/base on 2017 Sierra), resulting in the removal of the Rear Vision Camera from the Sierra Convenience Package and Sierra Convenience Plus Package
- Replacement of base 4-speaker audio system with 6-speaker sound system on 1SA (base)Â Regular Cab models
- Replacement of base AM/FM stereo with 4.2-inch diagonal color display with GMC Infotainment System Radio with 7″ diagonal color touch-screen (IOB) as standard equipment on 1SA/base models
- Addition of Tire Fill Alert in Tire Pressure Monitoring system on single-rear-wheel models
- Addition of new content to All Terrain HD Package
See detailed 2018 GMC Sierra 3500HD changes, updates and new features here: 2018 GMC Sierra 3500HD change log.
The updates and changes described here are specific to the U.S. market and may be different for other markets.
Body Styles
The 2018 GMC Sierra HD is available as a heavy-duty full-size pickup truck with several cab and box configurations.
Sierra 2500HD Configurations (all with single rear wheel)
- Regular Cab, Long Box
- Double Cab, Standard Box
- Double Cab, Long Box
- Crew Cab, Standard Box
- Crew Cab, Long Box
Sierra 3500HD Configurations
- Regular Cab, Long Box
- Regular Cab, Long Box
- Double Cab, Long Box
- Double Cab Long Box
- Crew Cab, Standard Box
- Crew Cab, Long Box
- Crew Cab, Long Box
- 3500HD Chassis Cab (CC)
Models & Trims
The 2018 GMC Sierra HD is offered as a retail or fleet model, with the Sierra (1SA) being the base model.
2018 Sierra HD Retail & Fleet Models:
2500HD
- Standard Bed Crew Cab
- 2WD (TC20743)
- 4WD (TK20743)
- Long Bed Crew Cab
- 2WD (TC20943)
- 4WD (TK20943)
- Standard Bed Double Cab
- 2WD (TC20753)
- 4WD (TK20753)
- Long Bed Double Cab
- 2WD (TC20953)
- 4WD (TK20953)
- Long Bed Regular Cab
- 2WD (TC20903)
- 4WD (TK20903)
3500HD
- Standard Bed Crew Cab with Single Rear Wheel
- 2WD (TC30743)
- 4WD (TK30743)
- Long Bed Crew Cab with Single or Dual Rear Wheel
- 2WD (TC30943)
- 4WD (TK30943)
- Long Bed Double Cab with Single or Dual Rear Wheel
- 2WD (TC30953)
- 4WD (TK30953)
- Long Bed Regular Cab with Single or Dual Rear Wheel
- 2WD (TC30903)
- 4WD (TK30903)
2018 Sierra HD Retail & Fleet Trims:
2500HD
- Sierra base
- SLE
- SLT
- Denali
3500HD
- Sierra base
- SLE
- SLT
- Denali
Powertrain
The 2018 GMC Sierra HD is offered with the following engine and transmission choices (note that the standard transmission is listed first):
| Engine | Fuel | Aspiration | Transmission | Horsepower (HP) / Kilowatts (kW) @ RPM | Torque (lb-ft) / Newton-Meters (N-m) @ RPM | Axle |
|---|---|---|---|---|---|---|
| 6.0-Liter Vortec L96 V8 | Gasoline | Naturally Aspirated | 6-Speed Automatic (MYD) | 360 / 268.56 @ 5400 | 380 / 513 @ 4200 | 4.10 |
| 6.0-Liter LC8 V8 | Gasoline | Naturally Aspirated | 6-Speed Automatic (MYD) | 360 / 268 @ 5400 | 464 @ 4000 | 4.10 |
| 6.0-Liter LC8 V8 | Compressed Natural Gas | Naturally Aspirated | 6-Speed Automatic (MYD) | 401 @ 5200 | 380 / 513 @ 4200 | 4.10 |
| 6.6-Liter Duramax L5P V8 | Diesel | Turbocharged | 10-Speed Automatic (MW7) | 445 / Â 331.97 @ 2800 | 910 / 1228.50 @ 1600 | 3.73 |
To clarify, the 2018 Sierra HD is available in 2WD (rear-wheel-drive) as standard, while 4WD is optional.
Platform
Like all third-generation units of the GMC Sierra HD, the 2018 GMC Sierra HD continues to ride on GM’s GMT K2 platform shared with the Chevrolet Silverado HD.
Production
Depending on the model and configuration, the 2018 GMC Sierra HD is assembled across two GM factories:
- GM Flint Assembly plant in Flint, Michigan, USA
- GM Fort Wayne Assembly plant in Roanoke, Indiana, USA
Beyond 2018
The third-generation Sierra HD remains in production thru the 2019 model year. Afterward, the fourth-generation model entered production as the 2020 Sierra HD.
Discussion
Discuss the 2018 GMC Sierra HD in our GMC forum.
Sierra HD News
AEV Launches Chevy Silverado HD, GMC Sierra HD Snorkel Kit
First seen on the AEV GMC Sierra Grande Concept.
Read More »
GMC Sierra HD Deals In December 2024: Long-Term Financing
Plus, local market leases on heavy-duty pickup truck.
Read More »
