G 2500 3/4 Ton Van V8-6.5L DSL Turbo VIN F (1997)
Drive/Propeller Shaft: Description and Operation
Phasing
The propeller shaft is designed and built with the yoke lugs (ears) in line with each other. This design is called phasing and is used to reduce the
vibration in the driveline which occurs as a result of the way the universal joints move to accommodate the angle between the engine and rear axle. The
smoothest driveline will result when the propeller shaft is in phase. Small fluctuations in torque due to the changing angles occur at each universal joint
as the propeller shaft rotates. The propeller shaft is said to be in phase when the two ends of the propeller shaft experience the same torque fluctuations.
As the torque increases at one end it also increases at the other. This periodic motion produces smooth rotational velocity fluctuations and minimizes the
Jerk which would be produced with opposing torque changes at each end.
A one-piece propeller shaft will always be in phase unless it was built incorrectly. In this case it must be replaced and under no circumstances should it
