2010 4x4 pulling to right and clunking from underneath

Got the truck aligned today and still pulling to right/clunking. I can feel it in the floor pan. It sounds like it’s coming from the rear but Im hard of hearing and cant definitively say. It also seems to track with speed. As i go faster, say 40-50, it stops rhythmically clunking and will buck hard every so often. The front suspension components look and feel fine.