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In my experience both, NSK and NTN make 1st class bearings, in Japan. (Koyo, I'm not so sure....) And when it comes to tapered roller bearings, they are usually half the price of the US-made Timkens and do last the same... (And we do avoid the Chinese/Brazilian/etc. Timkens, even if they are...

Forget those numbers, most are obsolete nomenclature. Ball bearings are all metric, so take a caliper and just confirm the dimensions of each, shown below..... (Or look them up in any bearing catalog) Then go and buy your bearings with confidence, any known good brand.

I don't think so, Frank... 8 balls is std for all these bearings, without a loading grove. This is what comes in there, originally... Of course, you could also install a so called max-load type bearing with 11 balls, instead. Only it would prob. cost 3-4 times as much. For the matter...

That bearing with the missing cage (your second picture) is a common 6310 NR (snap-ring style, 110x50x27mm). You may get away with leaving the old roller bearings in place, but you better replace all 6 ball bearings on that input shaft, once you have it all apart. (see my post #5, for the...

Only......!? If that was true, and estimating 30 mph on average, that would be almost half a million miles...! :giggle:

Not 100% sure, but those appear to be fragments of bearing shields and cages. I guess that one at least of your input shaft bearings is falling apart. See the diagram in this post... Guess it's time to disassemble and repair. Or maybe find another T-case, somewhere near? Anyway, I foresee lots...

Pretty sure it does...! Outstanding reply post & great contribution!(y)