2004.5 - 2005 GM 6.6L LLY Duramax | Allison Transmission Tuning by PPEI

Enhance your driving experience and extend the lifespan of your Allison transmission with PPEI’s Transmission Tuning, specifically designed for the 2004.5 - 2005 LLY Duramax. PPEI’s 5-Speed Allison transmission tuning is a game-changer for your LLY Duramax, whether you seek optimal performance or overall reliability. Key Features: Adaptive Shift Strategy: Tailored to improve the overall performance of your LLY Duramax’s Allison 5-speed transmission, our tuning adjusts shift points dynamically, ensuring a smoother and more responsive driving experience. Refined Shift Points: Say goodbye to the low RPM "Lazy" feel. Our tuning eliminates the need for aggressive throttle inputs for downshifts, enhancing fuel efficiency and drivability, especially for trucks with larger tires and, most importantly, LLY Duramax trucks equipped with aftermarket turbos. Turbo Lag Reduction: Experience reduced turbo lag with optimized upshifts and downshifts, keeping your engine in the ideal RPM range f