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Drive Shaft Alignment

Drive Shaft Alignment

STANDARD PROCEDURE PROPELLER SHAFT ANGLE (You can use a socket and angle gauge in place of the Inclinometer)

Rear TJ Rubicon Drive Shaft

(1) Place transmission in neutral.
(2) Raise and support the vehicle at the axles as level as possible.
(3) Remove any external bearing snap rings from universal joint so protractor base sits flat.
(4) Rotate the shaft until transmission/transfer case output yoke bearing is facing downward.
NOTE: Always make measurements from front to rear and from the same side of the vehicle.

(5) Place Inclinometer 7663 (J-23498A) on yoke bearing (A) parallel to the shaft (Fig. 4). Center bubble in sight glass and record measurement.
NOTE: This measurement will give you the Output Yoke Angle (A).

Output Yoke Angle Angle Gauge on transfer case output yoke

(6) Rotate propeller shaft 90 degrees and place Inclinometer on yoke bearing parallel to the shaft (Fig. 5). Center bubble in sight glass and record measurement. This measurement can also be taken at the rear end of the shaft.
NOTE: This measurement will give you the Propeller Shaft Angle (C).

Propeller Shaft Angle Angle Gauge on propeller shaft

(7) Subtract smaller figure from larger (C minus A) to obtain Transmission Output Operating Angle.
(8) Rotate propeller shaft 90 degrees and place Inclinometer on pinion yoke bearing parallel to the shaft (Fig. 6). Center bubble in sight glass and record measurement.
NOTE: This measurement will give you the pinion shaft or Input Yoke Angle (B).

Input yoke angle Angle Gauge on rear differential yoke

(9) Subtract smaller figure from larger (C minus B) to obtain axle Input Operating Angle. Refer to rules given below and the example in (Fig. 7) for additional information.

1.
Good cancellation of U-joint operating angles (within 1).
2.
Operating angles less than 3.
3.

At least 1/2 of one degree continuous operating (propeller shaft) angle.


U-joint angle math example

This page last updated: 16-Apr-2008

Content and Design © 2002-present WanderingTrail,  Ron Seegert
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