What engine is in a Silverado 2500HD?
The Silverado 2500HD can be equipped with two main engines: a 6.6-liter V8 gasoline engine and a 6.6-liter Duramax turbo-diesel V8. The diesel offers the strongest torque for heavy towing, while the gasoline engine provides solid all-around performance for everyday use.
Engine options for the Silverado 2500HD
Chevrolet provides two primary powertrains for the heavy-duty Silverado 2500HD. Below are the details for each option, including key outputs and transmission pairing.
Gasoline engine: 6.6L V8
The gasoline option pairs with a traditional automatic transmission and is available across most trims, balancing power with everyday usability.
- Displacement: 6.6-liter V8 gasoline
- Horsepower: 401 hp
- Torque: 464 lb-ft
- Transmission: 6-speed automatic
- Drivetrain options: 4x2 and 4x4
For buyers who prioritize straightforward performance and potentially lower upfront cost, the gasoline V8 offers ample power for daily driving and routine towing without the complexity of a diesel setup.
Duramax turbo-diesel V8: 6.6L
The Duramax turbo-diesel is the higher-torque option designed for heavy workloads, long hauls, and maximum towing capacity. It is paired with a modern automatic transmission to optimize efficiency and durability.
- Displacement: 6.6-liter turbo-diesel V8
- Horsepower: 445 hp
- Torque: 910 lb-ft
- Transmission: 10-speed automatic (Allison)
- Drivetrain options: 4x2 and 4x4
The diesel option is the go-to choice for customers whose work involves pulling heavy trailers, frequent long hauls, or tasks where peak torque at low RPMs matters most.
Choosing between the options
Which engine is right for you depends on how you plan to use the truck. If your duties involve frequent heavy towing or high torque needs, the Duramax diesel is typically the preferred choice. If you mostly drive in daily urban or suburban conditions with occasional towing light-to-moderate loads, the gasoline V8 provides strong performance with simpler maintenance considerations.
Summary
In short, the Silverado 2500HD offers two engine choices: a 6.6L V8 gasoline engine with 401 hp and 464 lb-ft of torque, and a 6.6L Duramax turbo-diesel V8 with 445 hp and 910 lb-ft of torque. The gasoline option pairs with a 6-speed automatic, while the diesel uses a 10-speed automatic, and both are available with 4x2 or 4x4 configurations. Your pick should align with your towing needs, fuel costs, and how often you operate under heavy load conditions.
What is the difference between the 6.0 and the 6.0 Vortec Max?
From 2002-2005, the engine was referred to as the 'HO 6000'. In 2005/6 it was re-named to the Vortec MAX. In short, the MAX was a premium version of the standard 6.0L vortec and featured increased power output and increased towing capacity. The engine was only offered in high-trim packages for the Silverado and Sierra.
What year 2500hd to avoid?
Years to avoid for a 2500HD include 2003–2006 and 2014–2017 due to widespread electrical, transmission, and HVAC issues. For Ram 2500 models, the 2013 and 2018 models should be approached with caution due to engine and braking system problems respectively. More recent Ram trucks, specifically 2021-2023, have also had recalls for potential electrical and fire risks.
Chevrolet Silverado/GMC Sierra 2500HD
- 2003–2006: Known for a high number of owner complaints and reliability issues, especially with electrical systems, HVAC, and the engine management system.
- 2014–2017: Models from this period, particularly 2014, 2015, and 2017, had numerous recalls and high complaint rates.
- 2014: Had frequent air conditioning and transmission issues.
- 2015: Had a large number of recalls and is known for suspension and transmission problems.
- 2017: Is frequently cited for significant transmission problems.
Ram 2500
- 2013: Considered a poor year due to engine problems.
- 2018: Has the most complaints, with many related to the braking system.
- 2021–2023: Has a number of recalls and investigations regarding potential electrical shorts and fire risks.
What is the difference between 6.6 L V8 and 6.6 L Duramax?
The main differences are that the 6.6L V8 is a gasoline engine that offers 401 hp and 464 lb-ft of torque, while the 6.6L Duramax is a turbo-diesel engine with significantly higher torque (470 hp and 975 lb-ft) and better fuel efficiency, especially when towing. The Duramax is the superior choice for heavy-duty towing and hauling, while the V8 is a more budget-friendly and capable option for lighter use.
This video compares the 6.6L Duramax diesel with the 6.6L gas V8 in a Chevy Silverado HD: 28sBen HardyYouTube · Apr 21, 2023
6.6L V8 (Gasoline)
- Power: 401 horsepower and 464 lb-ft of torque.
- Best for: Everyday driving and lighter towing needs.
- Cost: Lower upfront cost compared to the Duramax.
- Fuel: Uses 87 octane fuel.
- Maintenance: Generally considered lower maintenance costs than diesel.
6.6L Duramax (Turbo-Diesel)
- Power: 470 horsepower and 975 lb-ft of torque.
- Best for: Heavy-duty towing and hauling due to its high torque.
- Cost: Higher upfront cost, but potentially lower operating costs for high-mileage drivers due to better fuel efficiency under load.
- Fuel: Uses diesel fuel and requires Diesel Exhaust Fluid (DEF).
- Performance: Offers superior pulling power and a robust build for long-term durability under stress.
This video discusses a comparison between Duramax diesel and 6.6L gas engines: 0:59PaxPowerYouTube · Jul 10, 2025
Which one should you choose?
- Choose the 6.6L Duramax if you frequently tow heavy loads or haul materials, as its massive torque is ideal for these tasks.
- Choose the 6.6L V8 if your truck's use is more for daily driving or occasional light towing. You will save money on the initial purchase, and it will handle most everyday tasks without issue.
You can watch this video to see a review of the 6.6L V8 engine: 58sGetty's GarageYouTube · Oct 30, 2025
What engine does a Silverado 2500 have?
Comparing the Chevy Silverado 2500 Gas Engine (6.6L V8) to the Diesel Engine (6.6L Duramax V8): Choosing between the gas and diesel versions of the Chevrolet Silverado 2500 HD can be a tough decision. Both engines offer impressive capabilities, but they each have their own strengths and weaknesses.
