2004.5-2005 Silverado & Sierra 2500 & 3500 6.6L Duramax LLY Allison Billet Input Shafts

The factory input shaft on your 2004.5-2005 Silverado or Sierra 2500 or 3500 6.6L Duramax LLY's Allison transmission is a known weak point and has a tendency to twist, crack, spiral, break teeth, or even break entirely when you add some serious horsepower to your truck, tow extremely heavy loads, or use multi-disc torque converters with high clamping loads. Tier One's selection of billet input shafts for Duramax LLY trucks are made out of much stronger materials than stock, which allows them to withstand hub amounts of load from high-powered Duramax LLY builds that are towing heavy or doing hard launches down at the track. Make sure you also check out our 2004.5-2005 Duramax LLY Torque Converters or our 2004.5-2005 Duramax LLY Flex Plates!