whitecollarredneck

I lifted my truck recently and after I put my 33s under it I noticed a vibration when letting out the clutch after down shifting and when driving in 3rd gear. My first thought was the pinion angle, but my driveline is practically straight in from the axle to the transfer case. I drove for 2 days before getting new tires and didnt have the problem then. I'm out of ideas.