BD Diesel Duramax Allison Transmission & Converter Package - Chevy 2004.5-2006 LLY 4WD

If you're looking to handle the serious power and torque your Duramax diesel can put down, especially when towing heavy loads or pushing it on the street or track, a robust transmission upgrade is key. This BD Diesel TorqueMaster Allison transmission and torque converter package is built to stand up to those demands for your 2004.5-2006 LLY Duramax 4WD Chevrolet Silverado 2500 HD and GMC Sierra 2500 HD.

BD Diesel matches the transmission and torque converter specifically for optimal performance and reliability, and they even dyno test them together. You'll find a significant increase in clutch count across all clutch packs – C2, C3, C4, and C5 all get more clutches, with C3 seeing a substantial 75% increase over stock. This, combined with high-energy GPZ frictions and a trapezoid teeth design that increases contact area while reducing chatter, means this transmission can handle more power. The package also includes a billet input shaft to manage the snap from rapid throttle changes and high horsepower, plus new sprag components and thrust bearings for long-term durability. The torque converter itself features an enhanced stall for street and towing applications, a cast stator to maximize torque, and a one-piece stamped forged cover that resists warpage from clutch heat.

Included with every transmission is BD's aluminum HD deep pan, which not only adds strength to the case but also increases fluid capacity by 3.5 quarts. This extra fluid helps keep temperatures down during demanding use. This package is designed to be a complete solution for upgrading your drivetrain's capability and dependability.