Spicer Driveline Installation Service Manual - Manual (Page 14)

11
Installation Techniques
Eliminating Compound Angle Induced Vibrations
Compound universal joint operating angles are one of the most common causes of driveline vibration. To avoid theses problems,
remember these important points:
• When setting up an application that requires compound universal joint operating angles, always keep the centerlines of
the transmission and axle parallel in both views.
• Always keep the offset between their horizontal and vertical centerlines small.
Note: Centerlines of transmission and axle must be parallel in both top and side views to use this method of determining true
universal joint operating angle. Please contact Spicer Driveshaft Engineering if you have an application where the compo-
nents cannot be installed with their centerlines parallel.
If adjustments must be made to the system:
• Install shims between the axle housing and springs to rotate the axle input yoke to change operating angles.
• Change operating angle on torque arm type suspensions by lengthening or shortening torque arms.
• Raise, lower, or shift side-to-side a pump, blower, or other piece of auxiliary equipment to change operating angles.
Note: It is important to remember to keep the centerlines of two components that are connected by a driveshaft parallel in both
the top and side views, so the operating angles will ALWAYS be equal.
Figure 7
Axle
Engine
Trans.
Engine
Trans.
Axle
Keep Angles Equal
and Offset Small
Top View
Side View
Less Than 3
Small Offset
o