The rotating assembly in the 2004.5–2007 5.9L Cummins consists of the crankshaft, connecting rods, pistons, wrist pins, and bearings. These components work together to convert combustion pressure into rotational power that drives the drivetrain.

Factory assemblies are strong, but performance builds often upgrade to forged parts for higher horsepower and torque handling. Balancing and matching these components is crucial for smooth operation and engine longevity.

A solid rotating assembly is the foundation of power and reliability in any Cummins build.