I was on my way to the shop this morning and when i slowed for a stop sign my truck started to vibrate once I hit about 25mph and continued almost all the way to the stop. Now every time I go to stop it does this? I don't notice anything when I speed up or if I get on it so my thoughts are maybe the torque converter isn't letting go? Thought maybe a U-joint at first but they all seem good? It makes no difference whether or not im on the brakes either? Any help would be greatly appreciated!