2001-2004 Silverado & Sierra 2500 & 3500 Duramax LB7 Complete Transmissions

The Duramax LB7 under the hood of your 2001-2004 Silverado or Sierra 2500 or 3500 can make a surprising amount of power and can still handle fairly heavy towing, even compared to modern trucks. The same can't be said about its transmission, especially after all these years on the road. Tier One's built transmissions for 2001-2004 Silverado & Sierra 2500 & 3500 Duramax LB7 trucks can hold all the horsepower and torque your LB7 Duramax can spit out, while at the same time handling heavy towing applications, tough off-road use, and aggressive launches down at the drag strip. We here at Tier one have everything from Duramax towing transmissions that can handle heavy hauling at near-stock power levels all the way to all-out Duramax competition transmission that can hold over 1000 horsepower and hard use at the drag strip without letting you down. Make sure you also check out our 2001-2004 Duramax LB7 Transmission Kits or our 2001-2004 Duramax LB7 Transmission Coolers!