Flywheel 3972705 fits Cummins ISB, QSB, 4B3.9, 6B5.9, 6C8.3, B4.5, QSB6.7, QSC8.3, QSL9, QSF3.8, and G8.3 engines. It stores rotational energy, smooths power delivery, and mounts the clutch or torque converter. Built to OEM standards for strength and durability.

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