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PPEI Allison Transmission Tuning For 2004.5-2005 GM 6.6L LLY Duramax 1999-2007 silverado 1500 which is why we’re offeringEnhance your driving experience and extend the lifespan of your Allison transmission with PPEIs Transmission Tuning, specifically designed for the 2004. 5 2005 LLY Duramax. PPEIs 5 Speed Allison transmission tuning is a game changer for your LLY Duramax, whether you seek optimal performance or overall reliability. PPEIs Allison 5 Speed Transmission Tuning is not just about performance; it's about longevity and efficiency. Fine tuning the transmissions