2017-2023 GM 6.6L L5P Duramax TCM Tuning

Complete your L5P powertrain calibration with a custom TCM tune. Designed as a standalone add-on to pair with your NWT ECM tune, this transmission calibration optimizes shift points, shift firmness, and torque management to match your new power levels and driving style.

TCM Credits

TCM tuning requires 4 credits. Select whether you need credits included or already have them on file.

• Credits Included — 4 TCM credits included with your tune purchase.
• Credits Not Included — You already have credits on file.

Key Benefits

• Optimized shift points to match your ECM tune and power output
• Improved shift firmness and transmission response
• Torque management calibrated for your build
• Reduces transmission slip and heat under load
• Pairs directly with our 2017–2023 L5P Duramax ECM Tuning

Fitment

• 2017–2023 GM 6.6L L5P Duramax
• Silverado HD / Sierra HD

Note: TCM tuning is a software calibration service. No hardware is included.