This is my theory...

First off the problem... When I first start my car up after sitting for a while. Everything is normal. No chatter no vibration. It just seems normal. After about 10 minutes of driving (when it gets warmed up) The clutch will start to vibrate badly and the transmission makes a sort of grinding/rattling noise.

Now I just realized that I have recently changed to Mobil 1 Full Synthetic. If I have the Intake Manifold Leak problem would this cause the above symptoms?

To add, I smell no weird oil burning smells. And I can't feel oil on the back of the intake. But It could possibly still be there. My question is, if my clutch is getting burned up by oil from the intake would it vibrate and grind all the time or only when the temps are up high enough that the oil is dripping on it.

Why would I only get extreme tranny vibration and noise when warm? I can also rev it up a little higher when taking off and it won't vibrate. I've got to figure this out its really bothering me.... Thanks everyone.