2004.5-2005 GM Duramax 2500HD/3500HD LLY Parts & Accessories

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

The Duramax LLY Silverados and Sierras are still some pretty capable trucks, but they definitely lag behind the newer Duramax trucks when it comes to power and performance. We here at Alligator Performance have everything you need to renew your Duramax LLY's performance, power, and capability so that it feels like an entirely new truck in practically no time at all. We have a whole bunch of Duramax LLY upgrades and performance parts that will let you get the most out of your HD Sierra or HD Silverado build and have it tearing up the streets, sled pull, or trail without breaking a sweat. That being said, there are more than few parts for Duramax LLYs to choose from, and finding a place to even begin can be a huge pain. Luckily, we at Alligator have a ton of experience with the Duramax LLY platform, and we're here to help you find the best Duramax LLY parts for your particular HD 2500 or HD 3500 build and its intended application.

2004.5-2005 Duramax LLY Engine Upgrades

One of the big areas that they LLY's have fallen behind in over the last couple of years is power, which is why our selection of 2004.5-2005 Duramax LLY Engine Upgrades is a first stop for most folks. Our engine upgrades for the Duramax LLYs can instantly add huge amounts of horsepower, torque, and throttle response to your Duramax LLY and take it from mild-mannered to viciously powerful in practically no time at all. These power and engine upgrades are an excellent way to get big-time performance gains out of your Duramax. One of the most cost-effective ways of adding big power to your GM HD 2500 or HD 3500 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.

While a tuner is a great way to give your Duramax some seriously big power gains, your average tuning device is pretty pricey and all that power may put extra strain on your aging truck that its motor may not be in the best shape to handle. That's why a Duramax LLY cold air intake kit is almost always a good bet. These intake kits for Duramax LLYs provide 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 and paper filter, 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

While the Duramax LLY Silverado and Sierras may have a clean, classic look, but even they came from the factory with a ton of front rake that gives them a stinkbug look and seriously limits you on wheel and tire options. 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 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 at their best when they're rocking some seriously big tires and an aggressive set of wheels. However, in order to squeeze them on, your Silverado or Sierra is going to need a serious bump in front and rear ride height in order to make it happen. That's where Alligator's selection of Duramax LLY lift kits come in. These complete Duramax lift kits give your truck a bunch of front and rear lift so that it gets both a towering, massive look as well as the ability to clear extremely big tires all in one place. Our selection of Duramax lift kits are available in a ton 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 these lift kits even come with high-performance shocks and other hardware so that your 2500 or 3500 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 quickest ways to give your Duramax LLY an entirely new look in practically no time at all is by adding a wicked set of wheels and a big set of tires onto your truck. We have a bunch of different Duramax LLY wheels and tires available that can help make 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 Duramax all-terrain tires, Duramax hybrid terrain tires, and Duramax mud-terrain tries available so that you can find the perfect balance of on-road ride quality and off-traction for your heavy-duty truck's chosen application. However, if you are going to install 35" or 37" , just make sure you have a leveling or lift kit.