what the HELL is that sound? 4kQ....

[Kwattro at aol.com]

so, now, sparatically, my gearbox, or something in the drivetrain, sounds 
like a learjet takeing off.  High pitched whirr, almost like straight cut 
gears (BTCC BMW320i - know what I mean?) speed related, not effected by 
clutch, diff locks, comes and gos, no apparent pattern - and not horrible, 
but noticable, and slightly disturbing.  Any ideas?  Something going south in 
the gearbox?  

Later!
Carter