Just jacked her up and checked the ball joints, solid to me. I'm guessing they would have caught this while doing my alignment as well.

I can just pull my front driveshaft out and test drive it w/o it and if the vibration goes away i know that's the culprit, no?

 

yes if it goes away there an issue there. ujoints in the drivelines will cause vibs

 

SMALL bit of play where it looks like the driveshaft has been extended after the lift was put in. Is this normal or should there be no play at all? This is the only movement I can find anywhere

 

Advice on best way to check u joints?

 

edit.

 

thats normal. you lifted the rig some so it extended you driveline. get under your rig in the rear. grab the driveline with both hands and wiggle the driveline before and after the ujoint while its in neutral. if there is any play you have an issue with the ujoint. also its very common that a ujoint cap seizes so you may have to unbolt the driveline. what you are describing is common with worn out ujoints.

 

see above ^