My CRV clunks sometimes, mostly when backing out and then shifting to drive and taking off it clunks. It is almost as if the rear end is catching up to the front end. Sometimes it also clunks taking off from a stop. I have checked the U-Joints and they are good and the transmission and rear differential have fresh fluid in them. I have just a little under 150k miles on it. Does anyone know what this problem is?