2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Parts and Accessories

2004.5-2005 Duramax LLY Engine Upgrades

Adding extra power, responsiveness and torque to your truck can really take its performance to the next level and make it drive like a new truck again, which is why our selection of 2004.5-2005 Duramax LLY Engine Upgrades is a great solution for your duramax. Our engine upgrades for the Duramax LLYs can add impressive amounts of horsepower, torque, and throttle response to your Duramax LLY and take it from mild-mannered to viciously powerful.  One excellent way to add big power to your GM 2500HD/3500HD is with a Duramax LLY Tuner. These tuning devices come jam-packed with new ECM programming that overwrites your stock software and changes certain engine parameters to give your 6.6L Duramax big gains in power and torque. New tuning increases boost pressure, changes fueling, and adjusts transmission function so that your Duramax LLY gets improved drivability on top of its new power. One of our favorite Duramax LLY tuners is the GM Duramax Edge CTS3. The CTS3 has powerful tunes that are paired with a device that has a huge touchscreen display that makes it one of the most effective vehicle monitors on the market today.

A Duramax LLY cold air intake kit provides a nice bump in power and response, all at a great price. Aftermarket HD Silverado or HD Sierra intakes provide more airflow into your truck's motor than the factory air box, which gives your Duramax an increase in horsepower, more torque, and better throttle response. Most of these intakes are extremely easy to install and come with everything you need to get them installed. One of our most popular LLY cold air intakes is the Duramax LLY Banks Ram-Air Intake System. The Banks Ram-Air kit comes with a new air filter, complete air box assembly, and new inlet tubing to replace all of the OEM intake components and get you nice power gains. Banks quotes gains of up to 39 horsepower and 69lb-ft of torque, all with an easy, hassle-free install.

2004.5-2005 Duramax LLY Leveling Kits

The factory stance of the GM 2500HD/3500HD leaves a lot to be desired, it has a ton of rake and not enough suspension height to fit large tires on it. The best way to fix both problems is with a Duramax LLY leveling kit. These leveling kits add just enough front ride height to your HD Silverado or HD Sierra to give to a clean, front-to-back leveled stance and the clearance to mount up bigger wheel and tires. We have a bunch of different Duramax LLY leveling kits available that range from basic torsion key kits to complete suspension packages that can give your HD 2500 or HD 3500 awesome on-road handling an excellent off-road performance so that you can take your Duramax LLY build anywhere you choose. One of our most popular leveling kits is the Duramax LLY Cognito 3" Performance Leveling Kit. Cognito's kit comes with a set of torsion keys that provide up to 3" of front leveling that are then paired with a pair of high-strength control arms and a full set of Fox 2.0 shocks that give your truck an excellent on-road ride and vastly improved off-road performance over the stock shocks.

2004.5-2005 Duramax LLY Lift Kits

The Duramax LLYs look their best when they're rocking big tires and an aggressive set of wheels. However, in order to fit them on, your GM 2500HD/3500HD suspension is going to need some help. That's where Alligator's selection of Duramax LLY lift kits come in. These complete Duramax lift kits give your truck more of front and rear lift to get both a towering, massive look as well as the ability to clear big tires with ease. Our selection of Duramax lift kits are available in a variety of different ride height levels, price points, and capabilities so that you can find the perfect lift kit solution for your Duramax LLY build. Some of our lift kits offer high-performance shocks and other integral hardware so that your 2500HD or 3500HD can handle just about anything you throw at it. One of our most popular lift kits for Duramax LLYs is the Zone Base 6" Lift Kit. Zone's lift kit gives your Silverado or Sierra 6" of front ride height and 5" of rear height which adds a big look to your truck and clearance for huge tires, all while keeping some rake for towing and hauling applications. Zone's 6" lift kit comes with a full set of shocks, compression struts, and all the hardware you need for the lift itself.

2004.5-2005 Duramax LLY Wheels & Tires

One of the most effective ways to give your Duramax LLY an aggressive stance and add impressive off-road capability is a set of Wheels & Tires. We have a huge variety of different Duramax LLY wheels and tires available that can help your Duramax LLY turn some heads both on and off-road. We have a bunch of Duramax 17" wheels, Duramax 18" wheels, and Duramax 20" wheels available in different widths, offsets, backspacings, designs, styles, and finishes so that you can find the perfect look and feel for your Duramax build. When it comes to tires, we carry more than a few Duramax 35" tires and Duramax 37" tires that will get your Silverado or Sierra a tough look, more ground clearance, and greatly improved traction. We have all-terrain tires, hybrid terrain tires, and mud-terrain tries available so you can find the perfect balance of on-road ride quality and off-traction for your heavy-duty truck's application.