Chevy & GMC 2500 & 3500 6L90E Transmissions & Transmission Parts

The 2007-2023 Silverdo and Sierra 2500s and 3500s with a Duramax V8 make a ton of power off relatively simple upgrades, but the stock 6L90E transmission starts to struggle with even mild tuning or heavy towing. Tier One's built 6L90E transmissions are manufactured to handle the kind of big power and torque that comes with aggressive Duramax tuning and performance upgrades. Our 6L90E transmissions for Silverado and Sierra HD trucks are the perfect way for your Duramax truck to hold immense power and handle tough truck applications both on and off-road. Tier One's built Silverado and Sierra transmissions are great for street driving, hitting those off-road trails, killing it at the sled pull, or dominating at the drag strip. Also check out our 6L90E transmission rebuild kits or our built Allison transmissions for select 3500 or 4500 trucks! Contact Tier One with questions or for custom builds!