2011-2016 GM Duramax 6.6L LMM Complete Transmissions

Once you add increased levels of horsepower and torque to your 2007.5-2010 GM 6.6L Duramax LMM, your factory transmission becomes a weak point which causes you unnecessary hassles down the road. Instead of trying to piece together the best transmission upgrades for your particular setup, choose from our selection of complete transmissions for reliable and consistent performance under every circumstance. These complete transmissions for your GM 2500/3500 drop right into place of your stock components and will handle the huge levels of power your Sierra or Silverado is throwing down. GM Duramax Fitments: 2007, 2009, 2010 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.