The rotating assembly in the 6.7L Cummins (2019–2024) includes the crankshaft, connecting rods, pistons, and associated hardware. It’s the core of the engine’s bottom end, converting combustion energy into rotational force to drive the vehicle. Built for strength and durability, the stock rotating assembly handles high torque demands, but performance upgrades often include forged components for added reliability under extreme conditions. A balanced, properly assembled rotating assembly is critical for smooth operation, longevity, and power delivery.