2007.5-2010 Silverado & Sierra 2500 & 3500 Duramax LMM Complete Transmissions

The Duramax LMM under the hood of your 2007.5-2010 Silverado & Sierra HD can make a ton of horsepower and torque with relatively few modifications and hold it reliably, but your truck's stock transmission may have a bad time. Tier One's built transmissions for 2007.5-2010 Silverado & Sierra 2500 & 3500 Duramax LML can hold all the power your LMM Duramax V8 can spit out, letting you use extremely powerful tuning, upgraded turbos, oversized injectors, exhaust upgrades, and just about anything else you have in mind without worrying about your truck's transmission letting you down. We here at Tier have everything from budget-friendly HD tow transmissions meant for towing at stock power levels to all-out competition transmissions that can hold over 1000 horsepower and survive hard launches at the track so you can crush your competition. Each of these transmissions feature upgraded components that give your Duramax LMM improved reliability and power holding for anything you have in mind. Make sure to also check out our 2007.5-2010 Duramax LMM Transmission Kits or our 2007.5-2010 Duramax LMM Transmission Coolers!