Vibration when barely on gas pedal

I've got a slight vibration seems like somewhere in the driveline when I'm on the highway and I barely touch the gas pedal. It goes away if I let it coast and goes away if I push harder on the accelerator. What's the problem here?

2004 double cab
Trd stock Suspension

 

u-joint maybe but more then likely its a bad carrier bearing or maybe both.

to test, jack rear end off ground, support with jack stands and wheel chocks, then get under there and wiggle the u-joints and test the carrier bearing for movement, its ok to have about 1/8" of wiggle in the carrier bearing but I would be concerned if it has any more then that. naturally you want no play in any of the ball joints

 

Mine was doing the same. I figured it was the u-joint. Just feel like doing it. It got much worse so it was time and got around to it. Just drove it the past couple hours. No vibration at all.

 

U joint or cv joint (usually the inner).

 

U-joint

 

What's the cost of doing that? Hard to to myself?