1.loud grinding,vibrating noise under tranny tunnel 2.tapping noise from engine

What is your question?

I hear a loud vibrating noise from tranny tunnel, mainly when RPM's are a little high and I let off gas pedal. If I engage clutch or step on gas pedal it goes away. have new muffler and pipes. heard it could be cat. converter has gone to pieces. 2. noise is a tapping or ticking noise constant from engine. I assume a flat spot on lifter or valves need to be adjusted.