Mechanics aren't perfect and people often come up with names for things that aren't really what they are.
If it is the pinion yoke, the right way is to take the whole rear end apart, replace the crush sleeve and reset the pinion bearing preload.
The easy way is to either mark the threads and nut and reinstall just how it came off (somewhat dangerous because the lock nut can come loose, they're generally a one time use thing and I've seen them fail even after one re-use) or to just snug the pinion nut up (also dangerous, easy to tighten it too much or not enough which will destroy the pinion bearings and potentially the ring and pinion in very short order).
Basically it's do it right and know it will be good or do it the easy way and hope. I've known people who have and haven't had success with the easy way (mostly success). Depends on how much you care about the rear end I suppose.
