Transmission Tune Only for EFI Live Spade

Features:

• Fits 2015 6.6L Duramax LML
• Transmission tune for EFI Live
• No additional license required
• Uses existing AutoCal hardware
• Optimized torque converter lockup strategy
• Increased line pressure for clutch holding
• Prevents short shifting under load
• Improves shift timing and firmness
• Keeps engine in optimal rev range
• Enhances drivability with ECM tuning
• Ideal for larger tires and turbos
• Improves towing and performance control

Make Your 2015 LML Shift The Way It Should Have From The Factory

If you have added power to your 2015 Silverado or Sierra 2500HD or 3500HD LML, you already know the factory transmission tuning can feel like the weak link. The engine pulls hard, but the shifts may feel soft or delayed, especially under load. This Transmission Tune brings everything together so the truck feels tighter, quicker, and more responsive every time it grabs the next gear. By refining torque converter lockup strategy and increasing line pressure, it helps put power to the ground instead of letting it slip away. Additionally, the improved shift timing makes towing feel more controlled and predictable on long grades. You will notice the difference during everyday driving too, with firmer shifts that make the truck feel stronger without being harsh. It is one of those upgrades that transforms how the whole truck feels, not just how it accelerates.

Advanced TCM Calibration Designed To Complement ECM Tuning

This Transmission Tune is engineered specifically for the 2015 6.6L Duramax LML and is designed to work with your existing EFI Live AutoCal hardware. No additional license is required, making it a straightforward upgrade if you are already running custom ECM tuning. The calibration adjusts shift points, line pressure, and torque converter lockup parameters to keep the engine operating within its preferred rev range. Furthermore, it helps prevent short shifting in performance applications and improves clutch holding capacity for trucks making additional power. This is especially important for vehicles running larger tires, modified turbos, or built transmissions that alter factory operating characteristics. When towing, the refined shift strategy keeps the truck in its power band and reduces unnecessary gear hunting. For owners who want a cohesive drivetrain that works as one system, this TCM tune delivers the control and confidence your setup demands.

Fitment: 2015 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LML

Notes:

• Fits 2015 6.6L Duramax LML only
• Transmission tune only no ECM file
• Requires existing EFI Live AutoCal device
• No additional EFILive license required
• Designed to complement custom ECM tuning
• Recommended for larger tires or turbos
• Beneficial for built transmissions
• Improves drivability under towing loads
• Verify hardware compatibility before purchase
• California Prop 65 warning applies