Increase diesel capacity on 2001-2004 Chevy Silverado and GMC Sierra 2500/3500 6.6L Duramax LB7 crew cab long bed trucks with S&B's 65-gallon replacement tank. Built for LB7 applications only, this midship tank supports gooseneck and 5th wheel towing, includes straps, and is transfer-pump ready through its 1/2-inch NPT fitting. The larger tank helps towing, fleet, and long-distance drivers reduce fuel stops while maintaining fuel-gauge operation. Notes: GM DTE cannot be recalibrated for the larger tank, the OE skid plate is not compatible, high-flow truck-stop nozzles may not shut off automatically, and 2004.5+ LLY/LBZ/LMM trucks require a different tank.