I have a 68 with a 10 bolt and a 700r and a newer driveline all added by the previous owner, I'm replacing the rear u-joint which has the inner clips to hold the caps in on the driveline. I did find the exact same u-joint and when trying to get both clips in it is too tight to get the clips in even though both u-joints mic out the same. It's so tight it's hard to rotate the inside of the u-joint. Not sure why the old one came out and the new one won't go back in without being so tight. Should I force it together and run it?