Clunking noise when put in Drive

I have a 2005 Hyundai Santa Fe and I use it
to haul things on a big property. I had to go
off-road which is something I usually do, and
I heard a loud clunk when I went over a
bump. Then I started hearing the clunking
nonstop. It only happens in when I put it in
drive though, and very slightly in reverse.
Also I don’t know if this might have anything
to do with it but I found 3 ball bearings under
my car.