Vibration in overdrive

I have the vehicle listed above with a 3" lift all stock except for shocks and sway bar I believe. Slightly taking longer to shift but not shifting or running hard. No leaks anywhere. Wont maintain speed in wind or uphill. Rapidly will try to catch up if bogged down using cruise or if you try to ease faster with pedal it will down shift and sometimes hold in drive at 3,000 rpm and you have to let off gas slightly for it to shift. At 45 to 60 you can hear and feel vibration the most. If you let off the gas the vibration and noise instantly stops.