vibration when accelerating from a stop

How do u know if its the transmission mount?

 

Take it in to the dealer

 

I have a similar suspension setup and have slight shudder/ vibration like you. Never was a problem until I lifted and angles were changed. Did you ever find a solution? I'm considering a driveshaft spacer but want to make sure before I start adding parts...

 

I took mine to a local mechanic. On the lift he showed me that one of the U joints were bound up. Not much movement. Kinda like if a circle was flat spotted when it rolls. I had been driving it on the interstate for several days. He said I was lucky I didn't drop it. He charged me $130 to replace it.