2020-2024 Chevy & GMC 2500 & 3500 Duramax L5P Parts & Accessories

The L5P Duramax 2500 & 3500 trucks offer a ton of power and capability right off the showroom floor, but there's so much more potential just waiting to be unleashed by the right combination of Duramax L5P parts from Tier One! We have all the parts and accessories for L5P Duramax trucks that you need to add a massive amount of power to your Silverado or Sierra 2500 or 3500, as well as the ability to hold that power and put it down to the ground. Tier One has everything from our very own Duramax L5P built transmissions and transmission rebuild kits to Duramax L5P tuners, Duramax L5P cold air intakes, Duramax L5P exhaust kits, GM 2500 & 3500 leveling kits, GM 2500 & 3500 lift kits, and much more! Tier One is your one-top-shop for L5P Duramax upgrades, and we have everything you need to transform your truck right under one roof. Check our our built Allison Transmissions and our built 6L90E transmissions. If you don't see something you're looking for, contact Tier One or call 602-399-5484!