Pre-Tuned Replacement T87A TCM 2017-2019 (L5P) Allison Transmission

Pre-Tuned Replacement T87A TCM 2017-2019 (L5P) Allison Transmission

2022-2024 Cummins 6.7L Switch On The Fly Custom Tuning

2022-2024 Cummins 6.7L Switch On The Fly Custom Tuning

3.0L GMC/Chevy Silverado/Sierra 1500 LM2 Duramax 2 Tune Pack (2020-2021)

  • Eliminates all feeling of dead pedal
  • Speed limiter adjustments for tire size
  • Smart remember function keeps your truck's settings locked in place even after tuning off the vehicle
    • Start/Stop function
    • Tow Haul function
    • Sport mode selection
  • Better performance in higher elevations
  • Improved exhaust braking function
  • More torque in all engine operating ranges (RPMs)
  • Dramatically improved power at higher RPM's
  • More confident towing
  • Truck feels lighter when accelerating even with a load
  • Improved towing performance hauling maximum payload
  • No need to remove your factory emissions equipment
  • Reduced soot production/build-up
  • Maintain factory levels of reliability


$1,566.94 was $1,917.94

In stock

Customize 3.0L GMC/Chevy Silverado/Sierra 1500 LM2 Duramax 2 Tune Pack (2020-2021)
LM2 Two Tune Pack   + $399.00
LM2 Unlock Service - Send in your ECM to be Unlocked   + $399.00
HP Tuners MPVI3   + $399.00
HP Tuners Credits x 6   + $299.94
Flat Rate Round Trip Shipping for ECM and/or TCM   + $70.00

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3.0L GMC/Chevy Silverado/Sierra 1500 LM2 Duramax 2 Tune Pack (2020-2021)
3.0L GMC/Chevy Silverado/Sierra 1500 LM2 Duramax 2 Tune Pack (2020-2021)

In stock




    Get your 2020-2021 LM2 tuning from the experts. With the option to choose between 2 custom tunes designed to bring out the best in both top-end power and towing torque for the 3.0L Duramax. These tunes will improve the drivability and performance of your 3.0L Duramax using the same tuning methods we’ve honed over years of tuning the L5P to maximize reliability and longevity of the powertrain. 

    Our custom tuning is exactly what the LM2 needs to wake it up and unlock its true performance potential. Combining the engine tuning with T93 Transmission tuning is the ultimate way to match your transmission holding capacity, shift schedule, and torque converter clutch engagement to the new found torque of your 3.0L Duramax allowing it to lug like a diesel. LM2 ECM Unlock Service, ECM Tune, Hardware, and Credits included. 


    Here's How It Works...

    • Once you place your purchase with us we will send a shipping label to your email 
    • Then remove your ECM and use the provided shipping label to ship them to us
    • Once we receive it we will begin the unlock process (Which takes 1-2 days)
    • When your ECM is unlocked we will ship it back to you with tuning hardware and tune files
    • You will then be ready to install them back into your truck and install our custom-tuning

    Custom Tunes:

    Sport Tune

    • Improved Horsepower & Torque +40 RWHP +100 ft-lbs
        • Immediate throttle response, no dead pedal feeling
        • Significantly wider torque curve
        • Smooth power curve thats fun to drive 
        • Most power & torque you can add while maintaining OEM levels of reliability
        • Thermal backdowns automatically manage your EGTs and other engine temperatures to back power down before damage occurs
    • Fun Mix of Power and Superior Drive-ability
        • Quick acceleration - Truck feels lighter
        • Great balance between performance and everyday drivability
        • The throttle pedal responds exactly how you want it to
        • Factory turbo brake retains complete functionality
        • Too much power to safety tow without proper gauges

    Tow Tune

    • Balance between Daily Driving and Towing
        • Air-Fuel Ratio limits built into calibration to limit soot production
        • Designed for towing up to 9,000 lbs. 
        • Factory turbo brake retains complete functionality
    • Horsepower & Torque Increase +25 RWHP +60 ft-lbs
        • Get your truck up and moving more quickly
        • More useable power in all driving scenarios
        • Have enough power to Shift Up, Throttle Back”
        • Get your trailer up and moving more quickly
        • Air-Fuel Ratio limits built into calibration to limit soot production
    • Revised pedal sensitivity
        • Low-speed trailer maneuvering
        • Back up with trailer without lurching



    Included Service:

    Unlock Your Stock LM2 ECM Service Included (Engine Control Module)

    • Remove your factory ECM and use the shipping label we email you to send it in
      • All shipping charges are included in this price
    • We will expedite the unlock process for you and return your ECM ready for tuning to be installed
    • Your other Included Hardware will ship to you with your Unlocked ECM
    • We generally turn Unlocked ECMs in around within 2 business day


    Custom Tuning

    • Street Tune +40 RWHP +100 ft-lbs
    • Tow Tune +25 RWHP +60 ft-lbs


    Included Hardware:

    MPVI3 Hardware by HP Tuners Included

    • Connect > Read > Edit > Write > Drive.
    • Equipped with Bluetooth®, Proprietary Expansion Port, and Mobile Device Support
    • Makes it faster and easier to read, edit, and write your vehicles software.
    • VCM Editor and VCM Scanner and programming/USB cables, making up the essentials of VCM Suite - one of the most powerful and inclusive scanning, diagnostic, logging, and calibration products on the market.
    • Full support for our latest rendition of Track Addict - the fastest scanning, logging, and data transmission rates to ensure you capture everything.
    • VCM Scanner is the most powerful and comprehensive scan tool on the market.
    • View, chart, and log diagnostic data in real-time via the OBDII diagnostic data port.
    • View and clear Diagnostic Trouble Codes (DTCs) along with other vehicle module information. Command control functions like a closed loop, fans, gear select, timing, air-fuel ratio and so much more all in real-time. 


    HP Tuners Universal Credits Included

    • 6 credits are required for ECM tuning

    Why Choose Custom LM2 Tuning?

    • DuramaxTuner has 15+ years of experience tuning Duramax trucks
    • Designed to be safe for your engine and emissions equipment 
    • Fully customized tuning with 100+ calibration changes from stock
    • No hacking wires into control units or fuel pump and turbo sensors
    • More power and less soot than box programmers
    • World Class Customer Service Phone Support!


    Warning: This product can expose you to chemicals that are known to the State of California to cause cancer. For more information, visit