It sounds like we have the same problem. I think there are two problems out there some are felt everytime the clutch pedal is pushed in (engine running or not) then the way mine make noise is only when the engine is running and the RPM is around 2,000. Which is the normal shift point so it is really anoying. Mine has been this way since the truck was new and now has 14,000 miles and I think it is getting a little worse. It feels more like a vibration then anything else. You can be setting still in neutral and bring up the RPM to around 2,000 and push in the clutch pedal and about 1/2 through full pedal travel is when I get the noise/vibration. The dealer tryied his best to find the problem but has had no luck. They even went as far as to pull the transmission and clutch assembly. After inspecting everything they couldn't find anything wrong but did put in a new clutch disk and throw-out bearing since they had it all apart, but it made no difference. If you have any luck getting yours fixed let us know because it seems to be one of those problems that nobody can find the cure for