CHEVROLET Chassis Diesel Engine Lgh 5866-B 6.6L

( Model: EXPRESS 3500 VAN ), ( Fuel Type: Diesel ), ( Type: Engine Long Block ), ( Ipn: 5866-b ), ( Engine Size: 6.6 L ), ( Condition And Options: 6.6l, 8th Digit, Opt Lgh )

Review CHEVROLET Cab And Chassis 6.6l Diesel Engine Opt Lgh Miles fits 3500 2011–2016

Introducing the Chevrolet 5866-B chassis, a part of the 2011-2016 3500 series trucks that comes equipped with the powerful and efficient 6.6L diesel engine, opt LGH. This engine is a game-changer for those seeking robust performance and impressive fuel economy.

The 6.6L Duramax V8 diesel engine is renowned for its durability and reliability. It boasts a high-strength aluminum cylinder block and a compacted graphite iron (CGI) cylinder head, providing the engine with exceptional strength and heat resistance. The engine also features a variable geometry turbocharger and an exhaust gas recirculation system, which work together to optimize power output and reduce emissions.

The opt LGH designation refers to the engine's advanced features, including the LGH (Low-Pressure Exhaust Gas Recirculation System), which enhances the engine's combustion efficiency by recirculating a portion of the exhaust gases back into the combustion chamber. This system helps to reduce nitrogen oxide (NOx) emissions, ensuring compliance with strict emissions regulations.

Moreover, the 6.6L diesel engine delivers impressive power and torque, with 397 horsepower at 3,000 rpm and a maximum torque output of 765 lb.-ft. at 1,600 rpm. This translates to impressive towing capacity and hauling capabilities for the Chevrolet 3500 series trucks.

Additionally, the engine's fuel economy is commendable, with an EPA-estimated rating of 14 miles per gallon (mpg) in the city and 19 mpg on the highway. This impressive fuel economy is achieved through the engine's advanced technology, including its Active Fuel Management (AFM) system, which shuts off half of the engine's cylinders under light load conditions to save fuel.

In summary, the Chevrolet 5866-B chassis, with its 6.6L diesel engine opt LGH, is a powerhouse of a vehicle. Its robust design, impressive power and torque output, and impressive fuel economy make it an excellent choice for those seeking a reliable and efficient workhorse. Whether you're towing heavy loads or hauling large items, this engine is up to the challenge.

The Chevrolet 5866-B 2011-2016 chassis with the 3500 6.6L diesel engine (opt LGH) is a popular choice for those seeking a heavy-duty work truck. Here are some pros and cons to help you make an informed decision:

1. Powerful engine: The 6.6L V8 turbo-diesel engine delivers impressive power and torque, making it ideal for towing and hauling heavy loads.

2. Durability: Chevrolet trucks are known for their durability and longevity, making this model a reliable choice for those who need a workhorse.

3. Fuel efficiency: For a vehicle of its size and power, the Chevrolet 5866-B offers decent fuel efficiency, especially when compared to gasoline engines.

4. Towing capacity: With a maximum towing capacity of up to 23,300 pounds, this truck can handle even the heaviest loads.

5. Advanced features: This model comes with several advanced features, including StabiliTrak stability control, power steering, and a heavy-duty cooling system.

1. Cost: The upfront cost of this truck can be quite high, especially when compared to smaller trucks or used models.

2. Maintenance: Diesel engines require more frequent maintenance than gasoline engines, which can add to the overall cost of ownership.

3. Noise level: The diesel engine can be quite loud, which may not be ideal for those who prefer a quieter driving experience.

4. Fuel availability: Diesel fuel is not as widely available as gasoline, which can make finding fuel on long trips a challenge.

5. Emissions: Diesel engines emit more pollutants than gasoline engines, which may be a concern for some buyers.

In conclusion, the Chevrolet 5866-B 2011-2016 chassis with the 3500 6.6L diesel engine (opt LGH) offers impressive power, durability, and towing capacity. However, it also comes with a higher upfront cost, more frequent maintenance requirements, and the challenge of finding diesel fuel. Ultimately, if you need a heavy-duty work truck that can handle large loads and tow massive trailers, this model may be worth the investment. However, if you don't require such capabilities or prefer a quieter, more fuel-efficient vehicle, you may want to consider other options.

Details:

Run video in the link below. Complete LGH engine, Allison transmission, and floor shift transfer case. Good running dropout from a 2011 Cab Chassis Dramas truck. Ran and drove excellent.

This was a northern truck so the drive train is rusty.

specifications grokengines:

• for models: 3500
• for makes: Chevrolet
• for years: 2011-2016
• model: Express 3500 Van
• fuel type: Diesel
• type: Engine Long Block
• ipn: 5866-b
• engine size: 6.6 L
• condition and options: 6.6l, 8th Digit, Opt Lgh

seller grokengines:

• city: Canaan, New Hampshire
• # reviews: 467
• rating: 98.9%

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• sold: 0
• started: January 16, 2026
• availability: In Stock
• options: Ship-to-home
• quantity: 1

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• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Engines

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