2004.5-2005 Silverado & Sierra 2500 & 3500 Duramax LLY Valve Bodies

Your Duramax LLY's valve body is critical to your transmission's operation, and at higher power levels or during heavy towing, your OEM valve body can suffer from cross-leaks and other points of failure that can lead to weird transmission behavior or an outright failure. Tier One's performance valve bodies for 2004.5-2005 Silverado & Sierra 2500 & 3500 Duramax LLY trucks are designed from the ground up to handle more power and tough applications with the reliability your tough Duramax truck actually deserves. These Duramax LLY valve bodies use a combination of aftermarket upgrades and new OEM components to give your truck's transmission higher line pressures, excellent shifting, and the capability to handle far more power than stock while still using the OEM connectors and hardware without modifications. Make sure you also check out our 2004.5-2005 Duramax LLY Transmission Pans or our 2004.5-2005 Duramax LLY Transmission Coolers!