Did this occur prior to the pulley going out? You can get a roar from the viscous coupling but if didn't have it before then you it typically would not be it. You could check it easily by removing the fan from the clutch and seeing if the roar is still there. Has anyone used a mechanics stethoscope to help isolate the location?

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2003 X5 4.6is Estoril Blue
2005 Infiniti G35X
1972 Datsun 240Z
1991 Isuzu Impulse XS Sold
1972 Fiat 850 Spyder Donated
1972 Datsun 240Z Sold
1972 Datsun 510 Sold