E 250 3/4 Ton Van V8-5.4L CNG VIN M (1997)
Pinion Gear: Testing and Inspection
Drive Pinion Stem and Rear Universal Joint Flange Rear axle universal joint flange runout should be checked when all other checks have failed to show
the cause of vibration.
Another cause of excessive rear axle universal joint flange runout is improper installation of the rear axle drive pinion seal. If the spring on the seal lip is
dislodged, it will jam up and cock the flange. Check that possibility before replacing the differential ring gear and pinion because of excessive rear axle
universal joint flange runout.
