Have you checked the u-joints? Also, can you tell aprox where the noise is coming from? It is interesting that you only hear it in neutral or with the clutch is in. At that point, there is no pressure on the drive line which make me think u-joint or even an output shaft bearing in the trans. Check for play in the driveshaft and let me know what you find.
Joe
SPONSORED LINKS
Tuesday, July 20th, 2010 AT 10:23 PM