so yesterday i was driving my buddys car , its a 2000 BMW 325 coupe, and i noticed that everytime that i shifted gears there was a nocking noise, the only way i can explain how it sounded is for example if u have ever had anything loose in you trunk and you make a turn you know how it sounds wen its rolling around in the trunk, well thats how it sounds its really wierd so i was wondering if any one knows what might be worng with it, any help would be appreciated - thanks