2017-2019 GM 2500HD/3500HD 6.6L L5 Duramax Transmission Upgrades

If you've stacked on some high-performance mods on your 2017-2019 GM 6.6L Duramax L5P, chances are your transmission will start to feel the strain of increased horsepower and torque to your truck's entire drivetrain. Our premium transmission upgrades for your GM 2500/3500 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 GM Sierra/Silverado 2500/3500 consistent performance you can count on! GM Duramax Fitments: 2017, 2018, 2019 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.