2004.5-2005 GM 2500HD/3500HD 6.6L LLY Duramax Modules

Harness the full power of your powerful GM 6.6L Duramax by installing any of our featured aftermarket tuners! Grant your truck additional horsepower, torque and throttle by upgrading your stock PCM to a performance-oriented module! Designed to overhaul your truck's shifting for an enhanced gear-holding and optimized shift pressures, GM 2500HD/3500HD owners can expect a notable increase in overall performance. Achieve improved injection timing/pulse and fuel rail pressure with a new aftermarket PCM module from Alligator Performance. For even greater added power, check out our selection of Turbo Upgrades.  GM Duramax Fitments: 2004, 2005 GM 6.6L Duramax. Submodel Fitments: WT, Custom, LT, LTZ, High Country, 1LT, 2LT, Pro, SLE, SLT, AT4, Denali. Some exceptions apply, please see individual product pages for specific fitments.