11-16 Duramax Merchant Automotive Allison Maximum Transmissions Turbo While the seams are a

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11-16 Duramax Merchant Automotive Allison Maximum Transmissions Turbo While the seams are aDescription ALLISON TRANSMISSION OVERVIEW The 5 speed and 6 speed Allison automatic transmissions backing the Duramax diesel engines in GM 2500HD and 3500 pickups is a smooth shifting transmission that works very well in stock applications. But the factory Allison transmissions tend to have issues coping with heavy towing and hauling or even mild performance upgrades not to mention serious struggles with high performance modifications. As the go to