I always hear chatter from rear of my vihicle like where the rear Diffrential is whenever i am engaging the clutch into gears i hear chatter. it goes away when i press the clutch down at idle and if i release it sounds like rattling in the tranny. I was told this was normal by other Z owners. But i cant stand it its unlike any other car i drove. I love my Z but i feel like its going to break.

 

its not your LSD its most likely throw out bearing...find a shop and get it replaced, and it won't make noise anymore