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(4) Refer to Runout Specifications chart. tion, remove the propeller shaft, index the shaft 180°, (6) If the propeller shaft runout is now within specifications, mark the shaft and yokes for proper (7) If the propeller shaft runout is not within spec- ifications, verify that the runout of the transmission/ (8) Replace the propeller shaft if the runout still exceeds the limits. SERVICE PROCEDURES DRIVELINE ANGLE MEASUREMENT 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. • Check the condition of all suspension compo- nents and verify all fasteners are torqued to specifi- • Check the condition of the engine and transmis- sion mounts and verify all fasteners are torqued to PROPELLER SHAFT ANGLE MEASUREMENT To accurately check driveline alignment, raise and support the vehicle at the axles as level as possible. (1) Remove any external bearing snap rings, if equipped, from universal joint so protractor base sits (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 (3) Place Inclinometer on yoke bearing (A) parallel to the shaft (Fig. 9). Center bubble in sight glass and This measurement will give you the transmis- sion or Output Yoke Angle (A). (4) Rotate propeller shaft 90 degrees and place Inclinometer on yoke bearing parallel to 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 RUNOUT SPECIFICATIONS Front of Shaft 0.020 in. (0.50 mm) Center of Shaft 0.025 in. (0.63 mm) Rear of Shaft 0.020 in. (0.50 mm) Measure front/rear runout approximately 3 inches Fig. 9 Front (Output) Angle Measurement (A) 1 – SLIP YOKE BEARING CAP 3 - 6 PROPELLER SHAFTS XJ DIAGNOSIS AND TESTING (Continued) |