Would you happen to know where the vibration is coming from? I had something similar after I installed my lift. For me, I heard a rattle or knocking sound under my rig everytime I accelerated which would fade out in a few seconds. I also noticed when I would go over bumps quickly, the same rattle would appear.
I had a transmission line come off it's metal clip and it was taping on the frame and the acceleration knocking problem was due to my transfer case linkage after I put on the lift. I just replaced the whole linkage with a Novak shifter cable, I haven't had the problem ever since.