Fitment: 2020-2023 GM 6.6L DURAMAX L5P
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. Allison 10-Speed Transmission Tuning
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 shifiting in high performance senarios. 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 driveability
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
Product Return Policy
Some Circumstances in which credit will not be issued but not limited to:
Core Return Instructions: STOP! Please read to avoid costly delays!
Core refund acceptance is at the discretion of SUP and the manufacturer/remanufacture or the original product. Failure to follow the above policy may result in partial credit and/or no credit being issued. If you would like a core returned that has been denied acceptance, you may request that within 30 days and pay for return shipping. Cores that have not been accepted and are unclaimed by the customer after 30 day will be destroyed and disposed of.
Updated 08/22/2024
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