Rattle noise under acceleration
Hi I've got an EA Falcon which I put a 4 speed auto in months and months ago, where I took the motor out, etc etc.
Well ever since then I have a very loud and annoying tapping noise when the RPM of the motor is pushed up into the 3000's or higher. It sounds like a metal against metal type sound(sort of like tapping a coin against metal but louder), and you can't hear it at all until you push the motor speed up.(no this isn't noisy tappets)
The noise comes from what seems to be around the automatic bellhousing or the exhaust near the bellhousing, though the exhaust doesn't seem to touch.
Also we managed to reduce the noise a little by loosening the Automatic support arm bolts and then tightening them up, but the noise still kicks in, just at a higher RPM. Also I noticed it's worse when the motor is cold, and gets quieter as the car heats up.
I've just today as well got a 2.5" exhaust from the cat back, and now my car revs a bit more freely obviously the sound is even more evident.
Anyone have any ideas? Help!