"Viscous Clutch"? How can I tell?
 

I own a 2000 Volvo S80 T6 (B6284T). I need to replace the front right CV driveshaft. There are two shafts, depending on whether you have a "viscous", or "non-viscous" clutch. How can I tell? Any assistance would be greatly appreciated. I have to work fast, this is my only transportation.