duramax tuner

Duramax Tuner Pre-Tuned Replacement A50/T14 TCM for 2009-2010 (LMM) Allison Transmission

Thoroughbred Sku #: DUTDT1140000008001
Manufacturer Sku #: DT1140000008001

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Shipping Restrictions:
This part is NOT available to ship to the state of California.


NOTE: This product is for emissions compliant vehicles only and is non-returnable due to being vehicle specific.
NOTE: After you order, one or our tuning specialists will call you and ask for your Vin # & Tire Size.


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Product Details

Product Name: Duramax Tuner Pre-Tuned Replacement A50/T14 TCM for 2009-2010 (LMM) Allison Transmission
Manufacturer: Duramax Tuner
Manufacturer Part #: DT1140000008001
Thoroughbred Diesel Part #: DUTDT1140000008001
Fitment Notes: 2009-2010 GM Duramax LMM Allison Transmission

2500 and 3500 HD Silverado/Sierra's equipped with the 6.6L Duramax routinely have factory TCM issues that cause limp mode, loss of PRNDL display, and trigger check engine lights. The DuramaxTuner Pre-Tuned Replacement TCM is a brand new and upgraded TCM for your stock 2009 and 2010 Allison 1000 A50 Transmission Control Module. Your new TCM will arrive pre-programmed for your VIN and includes our custom TCM Tuning.

Why do you need TCM Tuning?

  • Required for the best possible drive-ability
  • TCM Tuning in the best tool to ensure your engine is operating within its preferred rev range

Benefits of TCM tuning over stock include: 

  • Refined shift schedule to take advantage of the wide Duramax Torque curve
  • Improved torque converter clutch engagement settings to allow lockup under heavy loads, planting the power to the ground and lower trans temps
  • Torque limitations adjusted to allow high RPM fueling in performance applications
  • 2nd gear start in 4WD low range (can tap down to first)
  • Further adjustments available for customers with larger than stock turbochargers or significantly oversized tires 

TCM Tuning is especially important for trucks with:

  • Larger tires (35”+)
  • Modified turbo(s)
  • Built transmission
  • Any modification that impacts operating RPMs


  • Keep your truck in its power-band when lugging up a grade


  • Optional 2nd or 3rd Gear Start for competition applications
  • Optimize your aftermarket turbocharger performance


  • Looking for a TCM for a 2013 GMC3500 6.6 with Allison t14. 24266710. Just want to make sure it isn’t back ordered before I order.

    Chris Johnson | 6/12/2023

    This item is on a national back order

  • Hi, I ordered the pre tuned tcm for my duramax in August. Do you guys have any information on when they are coming in? When I ordered it, I didn’t see they were on back order on the website but when I got the email after I purchased it said they were. I just want to know if there is any news because I’m dying for the part to come in, it’s been almost 4 months. Im definitely not happy and I know it’s not your guys fault but if I can’t get any information I am going to have to cancel my order.

    Cami | 11/25/2022

    No eta at this time. Please phone in an speak to a sales rep.

  • This shows it’s for the LMM. I have a 2007.5 LMM 3500. Will this work?

    Luke Bryan | 10/24/2022

    Yes, on back order at this time.