1. Car & Truck Engines Used/New Products
  2. sku: 5821274735783762
  3. GMC EDDCX6DW

GMC EDDCX6DW Engine Duramax Lly Diesel 6.6 115K

fits model: 3500, 2500hd, Sierra. make: Gmc. year: 2004–2005.

Eddcx6dw Gmc 6.6 Engine Duramax Lly 2004-05 Sierra 2500hd 3500 Diesel 115k Miles

( Manufacturer Part Number: EDDCX6DW ), ( Part Type: Engine ), ( Engine Base Cylinders: V8 ), ( Country Of Manufacture: United States ), ( Engine Displacement: 6.6 ), ( Placement On Vehicle: Front ), ( Fuel Type: Diesel )

Review GMC 6.6 Engine Duramax Lly Diesel 115k Miles fits SIERRA 3500 2500HD 2004–2005

Introducing the GMC EDDCX6DW 6.6L Duramax LLY engine, an iconic powertrain for the 2004-05 Sierra 2500HD and 3500 diesel models. Designed with robustness and efficiency in mind, this engine delivers impressive performance and reliability for heavy-duty tasks.

The heart of this engine is the 6.6-liter Duramax LLY diesel engine, which boasts a unique inline-six cylinder configuration that provides a balance of power and fuel efficiency. With a displacement of 6.6 liters, the engine features a single turbocharger, intercooled after-treatment system, and a Bosch common rail fuel system capable of delivering up to 300 horsepower and 520 lb-ft of torque.

One of the most significant features of the GMC EDDCX6DW engine is its durability. The engine block is made of compacted graphite iron, providing excellent strength and resistance to heat and fatigue. The cylinder liners are made of aluminum-silicon alloy, which offers superior wear resistance and reduced weight. Additionally, the engine features a cast-iron crankshaft, forged connecting rods, and forged pistons, all designed to withstand the demands of heavy-duty use.

The GMC EDDCX6DW engine also comes equipped with advanced emissions control technology. This includes a selective catalytic reduction (SCR) system that uses urea injection to reduce nitrogen oxide emissions. The engine's exhaust gas recirculation (EGR) system, cooled EGR, and diesel particulate filter (DPF) further help to minimize emissions and improve overall engine performance.

Another important aspect of this engine is its ease of maintenance. The oil filter, air filter, and fuel filter are all located at the front of the engine for easy access. The engine also features a rear-mounted battery and a power steering cooler, which help to improve cooling efficiency and reduce heat buildup.

With a total engine weight of approximately 1,860 lbs (844 kg), the GMC EDDCX6DW engine is a formidable powertrain for heavy-duty applications. It has a displacement of 6.6 liters and a bore and stroke of 3.93 inches x 4.01 inches (99.7 mm x 101.9 mm). The engine has a compression ratio of 16.5:1 and a maximum engine speed of 3,300 rpm.

In summary, the GMC EDDCX6DW 6.6L Duramax LLY engine is a powerful and reliable powertrain designed for heavy-duty use. Its durable construction, advanced emissions control technology, and ease of maintenance make it an excellent choice for the 2004-05 Sierra 2500HD and 3500 diesel models. Whether you're towing a heavy load or working on a challenging jobsite, this engine is up to the task.

The GMC Sierra 2500HD and 3500 from the 2004-2005 model year with the 6.6L Duramax LLY diesel engine is a popular choice among truck buyers due to its power and durability. Here are some pros and cons to help you make an informed decision about purchasing one with a 115,000-mile reading on the odometer.

Pros:

1. Powerful and Fuel-Efficient: The Duramax LLY engine delivers impressive torque and horsepower, making towing and hauling heavy loads a breeze. Additionally, it offers decent fuel efficiency compared to gasoline engines.

2. Reliability: The 6.6L Duramax engine is known for its longevity and robustness. Many owners report driving their trucks for over 300,000 miles without major issues.

3. Towing Capacity: With the right equipment, these trucks can tow up to 13,000 pounds, making them ideal for heavy-duty towing tasks.

4. Resale Value: GMC Sierra 2500HD and 3500 trucks with the Duramax engine have a strong following and good resale value.

Cons:

1. Maintenance Costs: The Duramax engine requires regular maintenance, such as DPF regenerations and injector replacements, which can be costly.

2. Complexity: The Duramax engine and its associated emissions system are complex and can be challenging to diagnose and repair for inexperienced mechanics.

3. Noise: The diesel engine can be quite noisy, especially under heavy load. This might not be an issue for those who use their trucks primarily for work, but it could be a concern for those looking for a quieter ride.

4. Fuel Availability: Diesel fuel might not be as readily available in some areas, which could be an inconvenience for long-distance travel.

Conclusion:

The GMC Sierra 2500HD and 3500 with the 6.6L Duramax LLY diesel engine offer impressive power, towing capacity, and reliability. However, they come with higher maintenance costs and complexity compared to gasoline engines. If you need a heavy-duty work truck that can handle significant towing tasks and have the budget and resources to maintain it, this truck could be an excellent choice. On the other hand, if you're looking for a quieter, more convenient daily driver, you might want to consider other options.

Recommendation:

Before making a purchase, have a trusted mechanic inspect the truck thoroughly, paying close attention to the engine, transmission, and suspension components. Additionally, ask the seller for maintenance records and receipts to help assess the truck's condition and future repair needs. If the truck checks out and meets your requirements, it could be a worthwhile investment.

Details:

It does not include the firm, ecm, or wiring. This listing is for a 6.6 duramax engine with 115k miles on it. I dont offer shipping.

part #: eddcx6dw prices

  • $4000.00-$6688.00

specifications grokengines:

  • for models: 3500, 2500hd, Sierra
  • for makes: Gmc
  • for years: 2004-2005
  • mpn: Eddcx6dw
  • part type: Engine
  • engine base cylinders: V8
  • country of manufacture: United States
  • engine displacement: 6.6
  • placement on vehicle: Front
  • fuel type: Diesel

seller grokengines:

  • # reviews: 11373
  • rating: 98.4%
  • city: Clarkston, Michigan

returns grokengines:

  • policy: No Returns

payments grokengines:

  • credit card: Mastercard
  • other
  • wallet: Apple-pay

shipping grokengines:

general grokengines:

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

offer grokengines:

  • options: Seller-arranged-local-pickup
  • sold: 0
  • started: September 1, 2025
  • quantity: 1
  • availability: In Stock
for models: 3500, 2500hd, sierra, for makes: gmc, for years: 2004-2005, part type: engine, engine base cylinders: v8, country of manufacture: united states, engine displacement: 6.6, placement on vehicle: front, fuel type: diesel,
category: auto parts > car truck parts accessories > engines engine parts > engines, sku: 5821274735783762,

Gmc EDDCX6DW Is Similar To:

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3 offers $4000.00–$6688.00 USD
  • Offer #1: $4000.00 price + $0.00 shipping estimate = $4000.00* total. Engine had zero blow by, zero cooling system problems and is drop in ready. The product is a GMC 6.6 Engine Duramax LLY designed for medium-duty vehicles like theChevy/GMC C4500 and C5500.FREE SHIPPING
  • Offer #2: $6688.00 price + $0.00 shipping estimate = $6688.00* total. Narrow Block Front Cast (Left/Right Side Has No Bosses) Turbo Diesel. Sierra 2500HD, Sierra 3500.FREE SHIPPING
  • Offer #3: $4000.00 price + $Calculated shipping estimate = $4000.00* total. ENGINE IS OUT OF A C4500 NOT A REGULAR PICKUP TRUCK This listing is for a 6.6 duramax engine with 115k miles on it.+$Calculated shipping

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