Hi I have a 2007.5 Dodge Mega Cab 6.7 Manual transmission. I am having a loud squealing sound when my truck is idling with out the clutch engaged and in neutral and when I depress the clutch a little bit sound goes away. Does it sound like the clutch throw out bearing or the main shaft bearing. I have 90,000 miles on this truck. Can anybody shed some light on this situation.