Alero Drive Shaft Help

Anyone have any drive shafts, mainly U joints going bad? I have 190,000 miles on mine and the tracking shuts off and different times and under different occassions. I have new rotors, hubs and pads so I know it's not the bearings. I do have a slight rumble I feel coming from the left side when braking real hard and when turning at slower speeds. On the highway I feel nothing but have a very faint knuckling sound. I am guessing a U joint is failing. A new shaft is less than $100 and I have replaced them on another car before.