Just a guess as I had similar on ome of my older cars.
If front wheel drive could be one of the universal joints on drive shaft to wheels.
A mechanic showed be a test method it's up to you if you want to try it. find some spare rideable ground and put it in hard lock right then left to put the car in tight circle if it's the uni joints it will knock louder as this test puts the joints under pressure.
Charlie
May 2009