Transmission

Bulletproof your drivetrain, eliminate clutch slip, and safely put your power to the ground on your 2006–2007 Chevy Silverado or GMC Sierra 2500HD/3500HD with our comprehensive selection of LBZ Duramax transmission upgrades. Whether you are running the legendary Allison 1000 automatic or the rare ZF6 manual transmission, the factory drivetrain components are notorious for failing when subjected to aggressive aftermarket tuning, massive turbo setups, or heavy fifth-wheel towing. Heat, excessive torque, and slipping clutches will quickly leave your truck stranded or stuck in limp mode. This category is your ultimate source for completely bulletproofing your LBZ's driveline. We feature dedicated subcategories for both automatic and manual transmission components, including fully built transmissions, billet torque converters, high-capacity dual-disc clutches, heavy-duty single-mass flywheels, massive aftermarket transmission coolers, and custom-tuned TCMs. We proudly supply industry-leading transmission upgrades from trusted brands like SunCoast, BD Diesel, South Bend Clutch, PPE, and Mishimoto. Browse our complete inventory of 6.6L LBZ transmission parts and subcategories below to permanently solve your drivetrain weak points and confidently handle increased horsepower.