2020-2025 GM 2500HD/3500HD 6.6L L5P Duramax Transmission Upgrades

When you’ve added high-performance mods to your 2020-2025 GM 6.6L Duramax L5P, your transmission can quickly start to feel the strain from the extra horsepower and torque. Instead of waiting for a failure, upgrade your transmission components now to ensure your truck stays reliable, even under heavy loads. At Alligator Performance, we offer a wide range of GM 2500HD/3500HD transmission upgrades, including transmission pans, torque converters, flex plates, modules, and even complete transmission systems. These upgrades provide more durability over stock, allowing your Sierra or Silverado to handle just about anything you throw its way. GM Duramax Fitments: 2020, 2021, 2022, 2023, 2024, 2025 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.