2000 Tundra V8 2WD has 211500 on the odo and just now decided to go clunky clunky when I slow down. It primarily happens during the downshift from 2nd to 1st. I read a few things and most responses were just to live with it. But I don't want to just live with it. Is it the u joints? Is it the slip yoke? Is it the center bearing? Enlighten me with your experiences and solutions please and thank you.