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Sounds like a u-joint to me. When you are on the throttle you are putting pressure on it and it's binding up. That is why it only makes noise when you let off the gas. My truck did the same thing.Replace the u-joints on both ends of the drive-shaft at the same time. Otherwise the older one will go out and take out the new one at the same time down the road.The stock ones are worth it. The after market ones just don't seem to last as long. However we have also had good luck with the Mitsubishi u-joints vs the stock ones. They seem to last just as long and are only half the price. I don't have the part number handy though.