the 3.21 FD passenger side OEM axle seal is no longer available and almost impossible to find on eBay or other on line sources. But the National/Federal Mogul seal #473215 will work. It has no resemblance to the OEM seal. With the help of 3.21 expert John B, I rebuilt my 3.21 back in 2006 and used that seal at that time. It has not leaked a drop in almost 100K miles.
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