2011-2016 GM 2500HD/3500HD 6.6L LM Duramax Transmission Upgrades

If you've thrown on some high-performance mods on your 2011-2016 GM 6.6L Duramax LML, your transmission will feel the strain of increased horsepower and torque to your truck's entire drivetrain. Our premium transmission upgrades for your GM 2500HD/3500HD truck ensures your transmission stays in one place when you add on a ton power for improved drivability and towing capability. Here at Alligator Performance, we offer transmission upgrades such as transmission pans, torque converters, flex plates, modules, and even complete transmissions to give your 6.6L Duramax consistent performance you can count on! Pair your transmission upgrades with our full array of Engine Upgrades! GM Duramax Fitments: 2011, 2012, 2013, 2014, 2015, 2016 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.