Basically, the factory TCM is commanding the ECM to pull fuel before the 1-2 shift to limit torque being sent through the transmission during the shift. This is much more noticeable with a built transmission and higher horsepower application, but can definitely be noticed in stock transmission truck as well. The next major adjustment within the TCM removes the major defuel felt on the 1-2 shift exchange at wide open throttle. By moving the shift point later in the rpm range, the engine will stay in a higher rev range keeping the engines power output where it needs to be. The bigger the tire, the larger the shift extension (rpm drop between shifts), so the factory TCM calibration can have a bit of a “short shift” feel where the engine rpm just drops too far and the engine lugs and struggles to accelerate. For those jumping to 35-inch or taller tires, the rolling resistance, rotating mass and overall change in gear ratio can really affect how the truck accelerates. While the TCM adjustments will be more noticeable in a modified application (bigger tires, bigger turbos, bigger injectors, etc.) an otherwise stock truck can benefit from the Duramaxtuner Matched ECM/TCM files.įirst off, since most 2001-2010 GM trucks came from the factory with lightweight 16-inch wheels and 30-inch highway tires, it’s not uncommon for owners to upgrade to a larger wheel and tire package. To get a better handle on this, Nick Priegnitz (owner and lead tuner at Duramaxtuner) set out to unlock all the hidden potential within the TCM. While the aftermarket has focused on the ECM performance side of things, the TCM adjustments have always been a step or two behind, especially in high horsepower applications. The OEM GM engineers worked tirelessly to match the programming found within the two to create good drivability for every situation. The 2001-2010 GM Duramax/Allison uses an ECM (Engine Control Module) and separate TCM (Transmission Control Module) that work together to produce the best vehicle performance and efficiency possible. One thing that has always lagged behind is better control of the Allison automatic transmission, but that’s what sets Duramaxtuner apart. Through continued time behind the wheel and thousands of hours on the chassis dyno, performance ECM software is out there to cover just about any owner’s wants and needs. Performance tuning is nothing new to the Duramax market, companies like Duramaxtuner of Marengo, Illinois, have been using EFILive software to create custom tuning for the 2001+ GM Duramax for many years. In doing so, they’ve created an all new frontier to better drivability in both stock and modified applications. Duramaxtuner has spent countless hours creating all new tuning via EFILive software to match their already potent ECM tuning to the Allison’s TCM software.
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