2001-2004 GM 2500HD/3500HD 6.6L LB Duramax Transmission Upgrades

If you've thrown on some high-performance mods on your 2001-2004 GM 6.6L Duramax, your transmission and Transfer case 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! Our excellent transfer case help keep the heart of your 4x4 system reliable and high performing to tackle any terrain in your path! Pair your transmission and transfer case upgrades with our full array of Engine Upgrades and Fuel System Upgrades! GM Duramax Fitments: 2001, 2002, 2003, 2004 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.