Increase range on 2004-2010 Chevy Silverado and GMC Sierra 2500/3500 6.6L Duramax LLY, LBZ, and LMM crew cab long bed trucks with S&B's 65-gallon midship replacement tank. It replaces the factory 34-gallon tank, includes an S&B sending unit, supports gooseneck and 5th wheel setups, and is transfer-pump ready through the embedded 1/2-inch NPT fitting. The design adds reserve capacity when the low-fuel indicator comes on, helping long-haul towing and work trucks reduce fuel stops. Notes: the OE skid plate is not compatible, GM DTE cannot be reprogrammed, and high-flow truck-stop nozzles may not shut off automatically.