Spicer Driveline Installation Service Manual - Manual (Page 9)

6
Installation Techniques
U-Joint Operating Angles
Reducing and Canceling Vibration
A key point to remember about universal joint operating angles: To reduce the amount of vibration, the angles on each end of a
driveshaft should always be SMALL.
To cancel an angle vibration, the universal joint operating angles need to be EQUAL within 1 degree at each end of a driveshaft.
On motor home applications and auxiliary transmission installations, the tolerance is 1/2 degree. (See Fig 2)
Figure 2
Trans.
Axle
Make angles small
Make angles equal