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I've never had them apart, but was told by a friend who is a Rockwell expert that "the only way to tell if it is a U joint is to look at the tag. If it says rockwell it should be Ujoint". As you can see from the pics, the tag does say Rockwell.
I did some searching on the internet and found that the axles weigh approximately 850 pounds each. I lifted them off my trailer with an engine hoist.