2008 grand caravan sxt transmission

this has been an outstanding van, quite reliable. it has about 115,000 miles on it. recently, i've noticed that the transmission makes a 'tapping' noise when it shifts or downshifts. every gear has that same slight 'tap'. the tranny shifts fine, smooth, but this sound worries me a bit. any chance this could be a u-joint issue? help appreciated!

CV joint? Usually a failing outboard joint will click in turns. An inboard joint will thunk on accel or decel and/or cause a vibration.