2017-2019 GM 2500HD/3500HD 6.6L L5P Duramax Complete Transmissions

It's no secret that the factory transmission on your 2017-2019 GM 6.6L Duramax L5P becomes a weak point once you've added on tons of horsepower and torque to your Sierra/Silverado's engine. Instead of trying to pick and choose the transmission upgrades that will best suit your particular applications, why not totally replace it with a complete aftermarket transmission? These complete GM 2500/3500 transmissions drop right into place of your stock trans and will be able to handle huge levels of both power and performance. GM Duramax Fitments: 2017, 2018, 2019 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.