I am writing for a second out side opinion.I have a 2004 Disco SE. It has 14,300 on the OD. My question is when I drive on the high way speed 25 to 45 MPH. If I quickly take my foot of the gas and then apply my foot to the gas petal quickly again. I hear a slight "metallic thud sound" coming from the area where the transfer case is located. (below the front passenger foot rest area). I asked my local dealer about this. They told me it was a normal sound and it was the transfer case breaking in. I personally think they do not want to deal with it if there is some thing wrong. I also asked an out side dealer. They said the noise was because of the slck in the long drive line. And the sound was normal. I also asked some of my fellow aircraft mechanics. They said to look at the U joints or low fluid in the transfer case. So far every thing is fine. Does any one else have the same sound?