Pinion seal number is; National Oil Seal 224205, made by Federal Mogul.
NOTE!! The nut that holds the drive flange on is LEFT HAND THREAD.
If you are just changing the seal be very careful reinstalling the pinion drive flange, there is a crush collar that sets the pinion preload and if you over tighten it it may put to much load on the bearings, to loose and you will cause a pinion wobble.
