2004.5-2005 Silverado & Sierra 2500 & 3500 Duramax LLY Complete Transmissions

The Duramax LLY V8 under the hood of your HD Silverado or Sierra can make a whole ton more power and torque than stock with the right combination of performance modifications and tuning, however, the stock transmission may not be thrilled with it, especially if you're also towing heavy or launching your truck at the track. Tier One's built transmissions for 2004.5-2005 Silverado & Sierra 2500 & 3500 Duramax LLY trucks can handle absolutely massive amounts of power and extremely tough applications both on and off the road without letting your big Duramax down. We here at Tier One have a variety of Duramax LLY transmissions available that range from our HD tow transmissions that can handle heavy towing at factory levels of power to our Duramax LLY competition transmission that can hold over 1000 horsepower and are perfect for dedicated drag racing trucks. Make sure you also check out our 2004.5-2005 Duramax LLY Transmission Rebuild Kits or our 2004.5-2005 Duramax LLY Transmission Coolers!