CV joints and half shafts don't make much noise when they fail. All you hear is a clicking or light crunching noise, mainly when turning and moving, and it's easiest to hear at low speeds. If there's no vibration associated with the noise, you'll have to determine if what you're hearing has a pattern. Does it occur once per wheel revolution? Only when you hit a bump? Does the noise stop when you turn slightly or when you apply the brakes lightly? Those clues will help.
There's also a somewhat common transmission problem that will cause a noise, and if corrected right away, can prevent serious damage to the transmission case. If allowed to continue, a large steel pin will catch on the housing and crack it. That's a pretty expensive repair. To find that, you can run the vehicle in gear on a hoist, then listen to various points to determine the cause.
The best place to take the van is a tire and alignment shop. They specialize in finding and correcting the causes of noises and rattles.
Saturday, August 16th, 2014 AT 8:04 PM