I have an 82 300TD. Yesterday, on the highway, I heard a soft thud from under the car...about where a front passengers feet would be. Almost sounded like something had fallen off the bottom of the car. I pulled over, gave a quick look under the car but didn't notice anything strange.

Over the next hour of driving I noticed these things:

-The steering was now pulling towards the right
-Its possible that there was a hum/road noise from the front wheels that I had never noticed before...although I don't know if it's always been there and I was just being hyper alert?
-Once I had to make a quicker movement with the wheel and it felt like the car got away from me for a second
-A few times I heard a clanking noise from the vicinity of the front passenger wheel. Both times it was at slower speeds while making a turn, and may have co-incided with hitting bumps...but not sure

Something obviously happened, but I'm not exactly sure what/where to look? Any thoughts?