I finally split the case open.....and the pinion bearing was mangled. In addition, the side bearings are very crusty. Ironically the cage and rollers are fine. The UNKNOWN is the armiture. I do not have that area freed up yet. I'm looking at $200 for bearings, seals, and few random small parts. I would gladly spent that and do the work if I knew the armiture would work. If I have to replace those parts too, I'd be better off to replace the whole assembly.