@“Honda Blackbird” mentioned, it is easy to get the yokes turned 180 degrees if you did not mark them when you did the U-Joint.
If you did your own you may want to pull it apart and turn the yoke 108 before you put it back together.
I did this once when my chalk mark got rubbed off as I worked. I pulled it apart and turned the yoke 180 and it was smooth again.
Yosemite