Q: Knocking under car.

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I have a very loud knock that sounds like it's coming from the driver's side wheel well of my car. The odd part is, the knock only happens when the car is rolling and the engine is not braking, turning, or under load. So the knocking doesn't happen when I accelerate, it doesn't happen when I brake, and it doesn't happen when I turn. It doesn't just get quiet, it stops completely. I've checked the u-joint, and both wheel assemblies. I'm at a loss...

My car has 200000 miles.
My car has a manual transmission.

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