Driveshaft carrier bearing, how much play is ok?

I got a vibration at 25mph + and a kind of hum.
Today I am going to try to equalize the drive shaft angles as recommended in the forum but while I was under there I can tell my driveshaft carrier bearing has some play, not much but I don't know how much is too much. The truck has 196k on it, time to change it anyway?

 

Time to change based on that milage alone if it's never been done.

Play should be less than 3/16" or so in the rubber doughnut and no cracks or tears. There should be zero perceptible play in the bearing itself.

If the bearing seems to be smooth and has no play you might be able to get away with reinforcing the rubber donut with construction sealant, there's some pretty good threads on that in the forum this is the method I went with when I replaced my carrier bearing before I installed it I reinforced it so it would last longer as the bearing itself was okay but my rubber donut was trashed.

 

So I never changed it. There are no cracks and it probably moved 1/8 total which seemed kinda normal. I added a couple washers between the housing and the truck as a test to try to equalize the angles better. This did help, the vibration is all but gone.

But...

The hum is still there, it does not seem like typical new tire noise either. There is another big clue too. At high speed turning right it goes away. But ONLY turning right. Ball joint? Tie Rod?

 

Or possibly a wheel bearing.
When mine went bad, it went from a whine at low speed, to a hum at high speed.
Then finally a roar/grumble that was no doubt “fair warning” to get it fixed ASAP.

Yeah, I was lazy. And I didn’t really want to do it.
But it was odd how the noise changed as the the bearing got worse.
Don’t do like me, change yours sooner. If that is your problem.

 

4wd?
Maybe needle bearing.