Thanks, that makes sense, I would have never considered the life of the seal.
How critical are the thrust blocks? I have one of the two, although its in rough shape and I can see where the pin broke. I checked the carrier for the remains but I didn't find anything. I'm considering machining one if I cant purchase replacements. I am also curious how important they really are to the operation.
As for the axle(s) themselves, one of them hangs out 1/4" more than the other (without the thrust block installed) when just inserted as far back as possible. Is this normal? I am thinking its fine and will be compensated for when I install everything, and all torqued down?