Something Clunking

[Granthem]

Hi guys - this issue is driving me insane. I did a search but couldn't see much.

I have a fairly serious sounding clunk around my transmission tunnel. It feels like something it's banging directly into it. The car ONLY does the noise over bumps and rough road. Smooth roads are perfect. Accel and decel do not affect it. Only when the car does over does a sharp join or bump does thr knock appear. I have had the car at the mechanic and he said everything looked good other then one rooted engine mount. I installed 2 new nismo engine mounts but no dice.

Mechanic reckons the gearbox mount looks fine, tail shaft looks fine, zorst is nicely mounted. I'm at a loss, and it's driving me insane.

Ideas? Transmission cross member bushes maybe? Any help is appreciated.

[Bsa]

Sounds like the exhaust is slapping it's not hard to do.

[34GeeTeeTee]

Should be able to see some form of contact mark if the sound is that significant... Have you gone over the exhaust with a light?