Car: 00 v6 STi

Symptom:

Cruise between 110 - 115 kph (gps) - 5th gear or 4th gear 80-90 kph

High pitched whine emitted from driveline - impossible to pin point - disappears under acceleration or on overrun, just there when holding constant speed.

It's too high in pitch to be a wheel bearing........

Loud enough to hear it reverb off concrete freeway dividers - kinda sounds like quiet straight cuts.

Has me stumped!

Originally thought it was a dry CV resonating (one inner had split boot) - changed both front shafts = No change
Changed all driveline fluids = No change
Rims & tyres = No change
Lowering 40 mm + new sway bars = No change
New front disc's and f/r pads = No change

Seems like something is resonating in the driveline....just can't freeekin find it!!

Any Ideas???

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