20-23 GM 6.6L L5P Duramax Calibrated Power Replacement T93 + TCM Tuning W/ HP Tuners Hardware + Credits
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$1,373.96
- Part Number: DM1MO1371082000
- Est. Ship Time: Usually Ships By Next Business Day

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The 2020, 2021, 2022, or 2023, 2500 and 3500 HD Silverado/Sierra equipped with the 10-Speed Allison transmission is known for their outstanding performance while towing. However, there are many complaints about how and when it shifts. Many customers gripe about the time between shifts and dramatic de-fuel. Also, the factory tune isn't intuitive. It doesn't drop a gear and go when you want it to and overall needs improvements.
DuramaxTuner's Custom TCM tuning will decrease the time between shifts and improve the clutch holding capacity by increasing line pressure electronically. This will make a more durable, better feeling, and better driving transmission. It can also help keep the engine in the ideal RMP range to utilize all of its potential power. 10-Speed transmission tuning can be utilized with and without a RatioTek shift kit installed.
The 10-Speed Allison found in your 2020-2023 L5P Duramax is known for its smooth shifts and great performance while towing. However, it still leaves a bit to be desired when it comes to shifting in high performance scenarios. It can fall behind due to its drawn-out shifts and its weaker clutch holding strength. Changing the factory calibration is especially important when you modify your truck and/or install ECM Tuning. Custom TCM Tuning gives you quicker shift changes, smoother operation, and an overall better driving experience.
What’s the difference between Mild and Aggressive Transmission Tuning?
Smooth Shift Points is the best choice for you if you . . .
- Want a similar feeling shift schedule to stock
- Have a near-stock truck with stock tire size and stock turbo.
- Installed a Box Tuner
- Are an “Everyday Diesel Guy”
- Use your truck as a daily commuter
- Looking to get the best fuel economy possible
Aggressive/Elevated Shift Points is the best choice for you if you . . .
- Have an upgraded turbocharger
- Run 35”+ size tires
- Prefer higher RPM operation or holding the gear longer
- Installed custom engine tuning
Why do you need TCM Tuning?
- Works with any ECM Tuning to provide smooth shifting and superior drivability
- Torque converter lockup strategy helps you put power to the ground when you need it the most
- Improve clutch holding capacity with increased line pressure
- Makes your truck feel more powerful
- Prevents short-shifting in performance applications
- Ensures that your engine is operating within its preferred rev range
TCM Tuning is especially important for trucks with:
- Any ECM Tuning, Box Tuner, or Throttle Booster
- Larger tires (35”+)
- Modified turbo(s)
- Built transmission
- Any modification that impacts operating RPMs
Towing & Performance
- Use the wider torque curve provided by ECM Tuning
- Keep your truck in its power band when lugging up a grade
- Quicker shifts mean less time between gears and more time putting power to the ground
- Optimize your aftermarket performance parts
Calibrated Power: DM1MO1371082000

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