Spicer Driveline Installation Service Manual - Manual (Page 13)

10
Installation Techniques
U-Joint Operating Angles
True Universal Joint Operating Angle
The True Universal Joint Operating Angle, which must be calculated for each end of the shaft with compound angles, is a combi-
nation of the universal joint operating angle in the top view, as determined from the chart, and the measured universal joint oper-
ating angle in the side view.
To determine the true universal joint operating angle for one end of a shaft, (compound angle C° in the formula shown in Fig. 6)
insert the universal joint operating angle measurement obtained in the side view and the universal joint operating angle obtained
from the chart into the formula.
Do the same for the other end of the shaft. Compare the resultant calculated universal joint operating angle for each end. They
should be EQUAL within 1 degree. If they’re not, the driveshaft will vibrate.
Figure 6
T
(2.15 )
(2.50 )
Angle in Top View (from Chart) SideView
S
Compound Angle (C ) =
T = 2.15 (A calculated angle)
S = 2.5 (The measured angle)
C = 2.15 + 2.5 2 2
C = 10.873
C = 3.3 (True operating angle)
o
o
o
o
o
o
T + S
2 2