Propeller Shaft Angle Measurement - Jeep 1996 Grand Cherokee Service Manual

3 - 6 DIFFERENTIAL AND DRIVELINE
SERVICE PROCEDURES (Continued)
shaft angles will change according to the amount of
load in the vehicle. Always check angles in loaded
and unloaded conditions.
• 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. Remove
any external bearing snap rings (if equipped) from
universal joint so protractor base sits flat.
(1) Rotate the shaft until transmission/transfer
case output yoke bearing is facing downward.
Always make measurements from front to
rear.
(2) Place Inclinometer on yoke bearing (A) parallel
to the shaft (Fig. 11). Center bubble in sight glass
and record measurement.
This measurement will give you the transmis-
sion or Output Yoke Angle (A).
Fig. 11 Front (Output) Angle Measurement (A)
(3) Rotate propeller shaft 90 degrees and place
Inclinometer on yoke bearing parallel to the shaft
(Fig. 12). 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).
(4) Subtract smaller figure from larger (C minus
A) to obtain Transmission Output Operating Angle.
Fig. 12 Propeller Shaft Angle Measurement (C)
(5) Rotate propeller shaft 90 degrees and place
Inclinometer on pinion yoke bearing parallel to the
shaft (Fig. 13). Center bubble in sight glass and
record measurement.
This measurement will give you the pinion
shaft or Input Yoke Angle (B).
Fig. 13 Rear (Input) Angle Measurement (B)
(6) Subtract smaller figure from larger (C minus
B) to obtain axle Input Operating Angle.
Refer to rules given below and the example in (Fig.
14) for additional information.
• Good cancellation of U–joint operating angles
(within 1°)
• Operating angles less than 3°
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