2020-2021 Silverado & Sierra 1500 3.0L Duramax Complete Transmissions

The 10L80 transmission in your 3.0L Duramax Silverado or Sierra is a complex piece of engineering, but it struggles to handle the low-end torque of the diesel engine over the long haul. Issues like CDF drum failure and weak bushings can leave you stranded. Tier One offers high-quality replacement transmissions for 2020-2021 Chevy & GMC 1500 3.0L Duramax trucks that are built to address these factory shortcomings. We utilize upgraded internal components and improved assembly techniques to ensure that your new transmission is more reliable and durable than the one that came from the factory. Whether you use your truck for daily commuting or heavy towing, our transmissions provide the peace of mind you need. Even a fresh transmission needs protection, so eliminate converter flex with one of our 2020-2021 Chevy & GMC 1500 3.0L Duramax Torque Converters. Heat is the enemy of any 10-speed, so protect your investment by adding one of our 2020-2021 Chevy & GMC 1500 3.0L Duramax Transmission Coolers. If you aren't ready for a complete swap but want to fix shifting issues, a valve body upgrade is a great place to start, so check out our 2020-2021 Chevy & GMC 1500 3.0L Duramax Valve Bodies. To get the most out of your new transmission, consider upgrading your fluid capacity with a deep pan from our section of 2020-2021 Chevy & GMC 1500 3.0L Duramax Transmission Parts.