Bad u-joint without feeling loose?

Is it possible to have a bad u-joint with out it feeling loose??

 

That's a little subjective. Are you testing for play while it's on the truck? It's much easier if you disconnect the U-joint to move it around.
Usually there is visual play or unevenness when rotating.

 

Not sure how they did it, I had a shop check them when I had it in for a new gas tank, they just said they feel fine but I’m get a pretty good vibration

 

Anything that spins can cause a vibration. Under what circumstances are you feeling it?

 

Anything over10hp and gets worse as I speed up, goes away briefly as I let off but comes right back weather in step on gas or keep coasting

 

Can you tell if the vibration is coming from more in the front or the rear of the rig? Are you lifted?

 

Yes 3” lift. Feels like back.. I need to check but someone mentioned that the splines where the center bearing is might not be aligned. And I did have the center bearing replaced but didn’t notice the vibration right after

 

It could be the front diff needle bearing on the driver side. It's been a common culprit for a vibration and roaring noise. Check out your driver side CV axle connection to the differential and see how much play you have.

Have you recently greased the zerk fittings for the u-joints and slip yoke on your rear driveshaft? Have you also greased the zerk fitting for the center ball of the double cardan joint?

https://www.youtube.com/embed/sXIfHArtvF8

 

Yes, all greased. When it warm up a bit I’ll check the front shaft.. thanks for the info