Drive Pinion Stem And Companion Flange Inspection

DRIVE PINION STEM AND COMPANION FLANGE INSPECTION

Check the companion flange runout when all other checks have failed to show the cause of vibration.
One cause of excessive companion flange runout is improper installation of the axle drive pinion seal. Check to see if the spring on the seal lip has been dislodged before replacing the ring gear and pinion.