My front passenger side upper u-joint broke. Wondering how to replace it? I've got the tire off and the hub assembly taken apart sliped off axle shaft. Now how do I get the rest of the axle shaft out?

 

What model and year?

 

If you are talking about the drive axle with CV joints at each end, you're going to have to disconnect the steering knuckle at the top ball joint to get it out. DON'T EVEN PUT THE WEIGHT OF THE TRUCK ON THE HUB ASSEMBLY WITHOUT THE BOLT ON THE END OF THE SPINDLE ON AND TORQUED!!!
I broke a drive axle removed the axle from the hub to get home, I got less than a hundred yard before it disintegrated. The drive axle spindle and nut compresses the hub together.