2017-2019 Duramax L5P 2500 & 3500 Parts & Accessories

Your Silverado or Sierra 2500 or 3500 rocking a Duramax L5P is already one heck of truck, but your friends here at Tier One can help you unleash the true power and capability of your Duramax L5P with our extensive selection of parts and accessories! Tier One has all of the Duramax upgrades you need to get more power, improved performance, and even more capability so that your big D-Max truck can dominate your competition both on and off the road. Tier One has everything from our own Duramax L5P built transmissions and transmission rebuild kits than can handle big-time power to bolt-on Duramax upgrades like Duramax tuners, Duramax cold air intakes, Duramax exhaust kits, GM 2500 & 3500 leveling kits, GM 2500 & 3500 lift kits, and so much more. Tier One has everything you need to transform your Duramax L5P into an awesome, custom truck build all in one place. Check out our built Allison transmissions or our built 6L90E transmissions. If you don't see what you're looking for, contact Tier One or call 602-399-5484!