Trying to diag a noise. Thoughts?

[Caboose302]

This has been bugging me for a while now. Finally got off my ass and took a video. Only happens between 2500-3000 RPMS under load. Won't do it at idle so I'm thinking its in the driveline. Possibly input shaft, main bearing?
Easiest to hear about 15 seconds in (right before it ends). Much louder in the car especially when its cold.
I can try to get a better video if it's hard to tell from this one.

 

[Chibbzee]

I don't hear anything wrong. It just sounds like my car coming up on 3k rpm.

 

[Caboose302]

I'll try to get a better recording of it. It's a definite rattle that's loud as hell in person.

 

[GT Rob]

You still have cats dose are cars have a heat sheild

 

[Chibbzee]

Check your flanges too. Could be a busted one. If you are certain it is abnormal. Check it at a stand still and free rev. See if you can still hear it. If you can, it's probably a heat shield that has rattled loose (as GT Rob said) or a busted flange that is making some crazy racket.

 

[Caboose302]

no it's only under a load. Won't do it sitting still. I don't have Cats. Has a full exhaust. A friend of mine was thinking something in the exhaust was rattling. But it sounds pretty solid to me. Not like a hollow noise and exhaust rattle. I don't have any exhaust leaks but i'll put it in the air soon and double check the flanges.

 

[Chibbzee]

Then that really can't be good. Hmmmm. It's an odd sound.

 

[Caboose302]

Yeah I wasn't thinking it'd be an easy fix. It sounds louder in the tunnel, that why I'm thinking transmission, maybe main bearing? It's all getting replaced soon anyway so it's not something that has to be taken care of this month. Just curious if anyone recognized it.