2004.5-2005 GM Duramax 6.6L LLY Transmission Upgrades

Once you've installed various performance modifications on your GM 6.6L Duramax LLY, chances are your transmission will have trouble compensating for the elevated levels of both horsepower and torque your Sierra/Silverado is throwing down. Here at Alligator Performance, our high-quality transmission upgrades and accessories will ensure your transmission stays in one place after adding on tons of power and performance. We offer transmission upgrades including transmission pans, torque converters, flex plates, modules, and even complete transmissions to give your 6.6L Duramax LLY consistent performance you can count on! GM Duramax Fitments: 2004, 2005 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.