I don't have a 3.9, but it's probably the fan running near engine RPM, the
viscous clutch takes a bit to loosen up & let the fan slow down.
/Curt
> I've got the 3.9 in my truck...
> After I startup the truck (or even if it's been idling for several
> minutes) it has a real nice roar to it. After a few minutes the roar
> goes away. I'm sure someone else has noticed this and knows exactly
> what it is. So I figured I'd ask.
>
> Craig Rash
> -------------
> 2000 Dakota Sport
> ClubCab
> Black
> 3.9 w/FABM
> JVC 12CD changer w/head unit
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