Current Lead Times: In Stock Engines Ship Same or Next Day - Out of Stock: 1-3 Weeks on Most Long Block Engines; 3-5 Days on Heads – *call us for more exact lead times for your specific build
The rotating assembly on a 2003–2004 5.9L Cummins includes the crankshaft, connecting rods, pistons, and bearings. These components work together to convert combustion into mechanical power. The crankshaft is forged steel, built for strength and durability, while the connecting rods and cast aluminum pistons handle high compression and heat.
The assembly is balanced for smooth operation and relies on consistent oiling to prevent wear. Known for its toughness, the 5.9L Cummins rotating assembly is a key factor in the engine’s longevity and performance, especially under heavy loads or increased power.
Building engines the way the OEM factory should have in the first place.
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