The 6.0L Power Stroke uses two different flywheels for the manual transmission.
A dual-mass flywheel is used on the F-250/350 Superduty truck.
The dual-mass flywheel can be identified by springs located around the flywheel on the engine side.
It can also be identified by an extra ring of bolts on the transmission side of the flywheel that holds the two masses together.
From the side it can be identified by the separation between the clutch surface and the starter ring.
