It isn't just a name thing since Timken makes the 9912S.Jerry and all, just for some observational input. I have a TJ Rubi with about 308k and have been suffering from this seal issue as well. I had to have the rear dif carrier bearings replaced at around 250k and replaced the original wheel bearings at the same time just because they were old. They were not leaking but one of the carrier bearings were sounding bad so I figured there would be trash in the gear oil because of that. I used Timken bearings and seals and they started leaking shortly after the install. I bought a new set of axles, bearings, seals and retainer plates just to make the change out quick and easy. I again utilized Timken Bearings and seals and they are leaking again. I had purchased another set of bearings and seals but have been putting things off until I can better determine the cause of the seal failure. I also used permatex gear oil silicone on the last install as a precaution. I have read here that the National seals seem to perform better so I bought a set just to compare. The National seals utilize a unique two piece design in the metal ring that compresses slightly to expand the rubber seal on the outside of the seal when the retainer plate is tightened. The inner seal design that seals the rotating axle also looks like a better design than the Timken. The original seals went for around 275k miles so there must be something different with the Timken that is inferior. I would sure like to see a set of original seals just to see to OEM design. I beleive they were Spicer but not sure. I would like to have one of them to compare. The Timken seals and packaging I have look legit, but the seals themselves are manufactured in Indonesia. The Nationals are Mexico so I guess that's just where we are with everything today. I'm going to install a new set of Timken bearings with the National seals and keep my fingers crossed. I am pretty confident the superior design of the National seal will cure the issue. I'll update in a few weeks after i get them changed.