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3 - 6
PROPELLER SHAFTS
DIAGNOSIS AND TESTING (Continued)
(4) Refer to Runout Specifications chart.
(5) If the propeller shaft runout is out of specifica-
tion, remove the propeller shaft, index the shaft 180°,
and re-install the propeller shaft. Measure shaft
runout again.
(6) If the propeller shaft runout is now within
specifications, mark the shaft and yokes for proper
orientation.
(7) If the propeller shaft runout is not within spec-
ifications, verify that the runout of the transmission/
transfer case and axle are within specifications.
Correct as necessary and re-measure propeller shaft
runout.
(8) Replace the propeller shaft if the runout still
exceeds the limits.
RUNOUT SPECIFICATIONS
Front of Shaft
Center of Shaft
Rear of Shaft
Measure front/rear runout approximately 3 inches
(76 mm) from the weld seam at each end of the shaft
tube for tube lengths over 30 inches. For tube lengths
under 30 inches, the maximum allowed runout is
0.020 in. (0.50 mm) for the full length of the tube.
SERVICE PROCEDURES
DRIVELINE ANGLE MEASUREMENT
PREPARATION
Before measuring universal joint angles, the fol-
lowing must be done;
• Inflate all tires to correct pressure.
• Check the angles in the same loaded or
unloaded condition as when the vibration occurred.
Propeller shaft angles change according to the
amount of load in the vehicle.
• Check the condition of all suspension compo-
nents and verify all fasteners are torqued to specifi-
cations.
• Check the condition of the engine and transmis-
sion mounts and verify all fasteners are torqued to
specifications.
PROPELLER SHAFT ANGLE MEASUREMENT
To accurately check driveline alignment, raise and
support the vehicle at the axles as level as possible.
Allow the wheels and propeller shaft to turn.
(1) Remove any external bearing snap rings, if
equipped, from universal joint so protractor base sits
flat.
0.020 in. (0.50 mm)
0.025 in. (0.63 mm)
0.020 in. (0.50 mm)
(2) Rotate the shaft until transmission/transfer
case output yoke bearing is facing downward.
Always make measurements from front to
rear. Also, be sure to take all measurements
while working from the same side of the vehi-
cle.
(3) Place Inclinometer on yoke bearing (A) parallel
to the shaft (Fig. 9). Center bubble in sight glass and
record measurement.
This measurement will give you the transmis-
sion or Output Yoke Angle (A).
Fig. 9 Front (Output) Angle Measurement (A)
1 – SLIP YOKE BEARING CAP
2 – SPECIAL TOOL 7663 (J-23498A)
(4) Rotate propeller shaft 90 degrees and place
Inclinometer on yoke bearing parallel to the shaft
(Fig. 10). Center bubble in sight glass and record
measurement. This measurement can also be taken
at the rear end of the shaft.
This measurement will give you the Propeller
Shaft Angle (C).
(5) Subtract smaller figure from larger (C minus
A) to obtain Transmission Output Operating Angle.
(6) Rotate propeller shaft 90 degrees and place
Inclinometer on pinion yoke bearing parallel to the
shaft (Fig. 11). Center bubble in sight glass and
record measurement.
XJ
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