2001-2024 Chevy Silverado & GMC Sierra 2500 & 3500 Duramax Parts & Accessories

The Duramax Silverado and Sierras are absolutely legendary trucks with a ton of power and capability in their bone-stock forms. However, even adding just a few Duramax performance parts and accessories from Tier One will have your awesome Silverado or Sierra churning out a ton more horsepower and torque so that you can absolutely shred on the street, out on the trail, or down at the track. We here at Tier One offer our very own lineup of Duramax built transmissions and transmission rebuild kits that can handle far more horsepower and torque than your Duramax's stock transmission. Tier One also carries a bunch of other Duramax parts and accessories, including Duramax tuners, Duramax cold air intakes, Duramax exhaust kits, GM 2500 & 3500 leveling kits, GM 2500 & 3500 lift kits, and a whole lot more. Be Tier One and Done with your awesome Duramax build today! Check out our built Allison transmissions, built 8L90E transmissions, built 6L90E transmissions, or our built 4L80E transmissions. If you don't see something you're looking for, contact Tier One or call 602-399-5484!