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USD 199
Part #: OZ-TT-LLY

Oz Tuner OZ-TT-LLY EFILive Custom TCM Tuning

2004.5-2005 GM 6.6L Duramax LLY (Trans Tuning Only)
Part #: OZ-TT-LLY
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Customize the performance of the Allison transmission in your 2004.5-2005 GM 6.6L Duramax LLY with the Oz Tuner OZ-TT-LLY EFILive Custom TCM Tuning. TCC Solenoid Short to Ground and Short to Open (PO742 and PO743) disabled. This will ensure that your lockup controller, such as the FPE AlliLocker, never sets a check engine light. Shift pattern optimized for your gear ratio and tire size. Can be tuned for a higher RPM shift schedules for larger than stock turbos, tall gear ratios and tall tires.

How It Works:
Once you purchase this tuning, Oz Tuner will contact you for specific information about your truck. This information includes VIN number, modifications, tire sizes, and more. Once this information is supplied, the experts at Oz Tuner will build TCM tuning specifically for your truck and you will receive the files via email to load into your EFILive device. 


  • TCM Tuning 
  • For Allison Transmissions
  • Optimized Transmission Performance
Note: This is tuning only. You must have an EFILive device to load this tuning into. Due to the fact that this product is software that is custom tuned to your unique VIN, it cannot be returned. 


  • MFG. Number OZ-TT-LLY
  • Manufacturer Name Oz Tuner
  • Shipping Weight 0.00 lb.
  • Fuel Type Diesel
  • Prop 65 WARNING: Cancer & Reproductive Harm -


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Emissions Notice

This product is not legal for sale or street use in California. Certain aftermarket products are subject to governmental emission standards regulated by the California Air Resources Board. In order for these products to be legal on a specific vehicle in California, the part number must receive a CARB Executive Order (EO) number. This number makes the part legal for use only on specific years, makes and models of vehicles. A decal with CARB EO number for these parts must be displayed in the engine bay to satisfy smog inspection requirements.