Why don’t my new U joints fit? (Solved, thanks!)

I hear ya with the press. Makes me leery everytime I use it lol. Usually I've scuffed the rust off to help them fit also.
Glad ya got it.
I’m fortunate to have a press here, so that’s what I’m using. At first I did think that I squeezed the yoke and made it too tight, so I measured both ends and they were 2-1/8” exactly.

Well, the slip yoke is done. Just as easy as that! I was being scared and not pressing the joints tightly enough. Easy peasy. Thanks guys!
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