I have the same noise coming from my transmission. The only thing is i just bought the freakin thing. Since i cracked the housing on my previous tranny. The place that found the transmission for me said that it was completely rebuilt but there was a little bit of noise coming from it when at idle. They also said the guy replaced every part in the transmission he couldnt find out what it was but they said it runs fine. From my experience its really loud when i first turn it on. the noise goes away after like 10 or 15 minutes of driving also it goes away when i hit the clutch. DO YOU guys think its the same problem for me? the throw out bearing