Whether you’re upgrading your ride or just need a replacement diesel engine transmission, Next Gen Diesel is the go-to source. We offer various aftermarket 2020 Allison transmissions, which are designed for Chevy and GMC trucks. Our transmissions are available in multiple models including street, superstock, competition, and race. For those that want to upgrade their vehicle as much as possible, we recommend the competition model. This powerful transmission is compatible with diesel engines up to 1000 HP. Our 2020 Allison transmissions are manufactured to be compatible with OEM components. Each transmission is crafted from durable and high-quality materials to ensure longevity. Check out our options!
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