Driveline Geometry

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Geometry Notes: For proper geometry, a drive shaft using simply 2 U-joints should have the U-joints operating at equal and opposite angles., as shown in the upper example below. In other words, the pinion shaft should point in a direction parallel to the output shaft of the T-case. In this way vibration cancellation is maximized. 

When you use a CV joint, vibration is cancelled in the CV joint itself. Thus, geometrically, you want the lower U-joint operating at close to zero degrees nominal. (For longevity reasons, try to set the lower U-joint at 3-5 degrees. zero degrees does not move the roller bearings, and it does not lubricate and wears out faster) This U-joint then imparts no vibration, then, and all of the angle is carried by the CV joint. (Lower example below)

 

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