ahhh, so then the Timken P/N represents a different actual seal...I'd love to cross-reference the OEM P/N in the Timken parts catalog and see what number comes up. But I guess you guys are also saying that the 8660S will work too?
Actually I think some mis-guided Timken engineer decided to try improve the Timken 4857 seal, while making it look fancy with the large rubber outside seal, and failed miserably! Even after peening down the outside lip on my 35c I was able to take a small screwdriver and put it between the lip/axle mating surface while popping it right out! No way I was going to use it and had to run to the parts stores. They were out of the National 4857 so went with the 8660S w/o the metal outside lip and no leaks after more than a year, knock on wood.
Interesting if you take the OE seal part number (4856336, item 7, Fig. 3-255) for the 44 axle from the 96 parts list and enter it in the below "Timken Seal Interchange and Cross Reference Guide" it references out to use the Timken 8660S (3rd up from far bottom right on actual page #150 which shows page 77 of 163 in my PDF view).
Wonder why it doesn't reference out to the Timken 4857, which is supposed to be like OE w/metal lip, and maybe they know they've designed/built a defective seal? When referencing the National 4857 the list says to use the Timken 4857 but as already shown they are not
While the 8660S seems to work fine one thing I don't like about it is it sits further back in the axle housing which can accumulate more dirt, grit, ice, salt, etc.. I would have rather used a seal with a metal lip on the outside like the National 4857, which the part store was out of, or Mopar if it has a lip.
Not sure why, but the 35 axle seal number (5252499, Fig. 3-250, Item 7) from the 96 parts list couldn't be found on the Timken seal cross reference guide and maybe it's been superseded with another newer number?