have about 150mi. on a new clutch and CV joints. Rattling type noise (almost sounds like a cover loose on something) just started up. Only heard when in gear and accelerating, and only in 2,3,4 and 5. The sound increases with speed. Ease off gas or depress clutch and it goes away completely. Any speculations on what may be going on would be appreciated. Nothing under there looks loose. Thanks.