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Flywheels are mounted on engine crankshafts. Its outer part has a gear tooth which allows the starter to rotate it until the engine starts up. The flywheel holds the clutch pack and connects with the transmission to transfer the torque generated by the engine. On vehicles with a manual transmission, the heavy metal flywheel helps out smooth out the power flow. It resists any sudden change in the crankshaft's speed of rotation, Vehicle with an automatic transmission or transaxle has a light drive plate or flexplate with a fluid-filled torque converter attached to the crankshaft which acts the same as the flywheel to smooth power flow.